docs: Edits and fixes

Author: igorlukanin

docs/pages/product/apis-integrations/mdx-api.mdx

@@ -53,6 +53,15 @@ directly to the upstream data source.
 - If some queries still go to the upstream data source, it should respond with a
 subsecond latency. Consider tuning the concurrency and quotas to achieve that.
 
+### Measure format
+
+The MDX API respects the [`format` parameter][ref-measure-format] of measures so that the
+values are displayed accordingly in Excel, i.e., `percent` formats values as percentages
+and `currency` formats values as monetary values.
+
+Currency formatting is locale-aware and responds to the language configuration set via
+the `CUBE_XMLA_LANGUAGE` environment variable.
+
 ## Using MDX API with Excel
 
 <InfoBox>
@@ -180,59 +189,10 @@ This is going to be harmonized in the future.
 
 </InfoBox>
 
-## Formatting
-
-MDX API supports formatting for measures to control how values are displayed in Excel.
-
-### Percent format
-
-You can format measures as percentages using the `percent` format type:
-
-```yaml
-cubes:
-  - name: orders
-    sql_table: ORDERS
-
-    measures:
-      - name: completion_rate
-        sql: "COUNT(CASE WHEN {CUBE}.status = 'completed' THEN 1 END) / COUNT(*)"
-        type: number
-        format: percent
-```
-
-### Currency format
-
-You can format measures as currency using the `currency` format type:
-
-```yaml
-cubes:
-  - name: orders
-    sql_table: ORDERS
-
-    measures:
-      - name: total_revenue
-        sql: "{CUBE}.amount"
-        type: sum
-        format: currency
-```
-
-Currency formatting is locale-aware and responds to the language configuration set via the `CUBE_XMLA_LANGUAGE` environment variable. This variable accepts either [Microsoft LCID (Locale Identifier)][link-lcid] values or language tags. The default value is `1033` (English - United States).
-
-For example, to display currency values using the Netherlands locale (Euro with comma as decimal separator), you can use either:
-
-```bash
-# Using LCID
-CUBE_XMLA_LANGUAGE=1043
-
-# Using language tag
-CUBE_XMLA_LANGUAGE=nl-NL
-```
-
 ## Authentication and authorization
 
 Authentication and authorization work the same as for the [SQL API](/product/apis-integrations/sql-api/security).
 
-[link-lcid]: https://learn.microsoft.com/en-us/openspecs/windows_protocols/ms-lcid/70feba9f-294e-491e-b6eb-56532684c37f
 [ref-excel]: /product/configuration/visualization-tools/excel
 [link-mdx]: https://learn.microsoft.com/en-us/analysis-services/multidimensional-models/mdx/multidimensional-model-data-access-analysis-services-multidimensional-data?view=asallproducts-allversions#bkmk_querylang
 [link-pivottable]: https://support.microsoft.com/en-us/office/create-a-pivottable-to-analyze-worksheet-data-a9a84538-bfe9-40a9-a8e9-f99134456576
@@ -242,4 +202,5 @@ Authentication and authorization work the same as for the [SQL API](/product/api
 [ref-views]: /product/data-modeling/concepts#views
 [ref-deployment]: /product/deployment/cloud/deployments
 [ref-pre-aggregations]: /product/caching/using-pre-aggregations
-[ref-rollup-only-mode]: /product/caching/using-pre-aggregations#rollup-only-mode
+[ref-rollup-only-mode]: /product/caching/using-pre-aggregations#rollup-only-mode
+[ref-measure-format]: /product/data-modeling/reference/measures#format

docs/pages/product/caching/recipes/joining-multiple-data-sources.mdx

@@ -72,7 +72,7 @@ cubes:
 
     joins:
       suppliers:
-        sql: "{supplier_id} = ${suppliers.id}"
+        sql: "{supplier_id} = {suppliers.id}"
         relationship: many_to_one
 ```
 

docs/pages/product/caching/using-pre-aggregations.mdx

@@ -270,7 +270,7 @@ This technique, together with multi-router Cube Store approach, allows you to ac
 
 In general, it's better to lean towards less partitions, as long as you are satisfied with query speed.
 
-For optimal _querying performance_, partitions should be small enough so that the Cube Store workers can process them in less than 100 milliseconds. 
+For optimal _querying performance_, partitions should be small enough so that a Cube Store worker can read (scan) a partition in less than 100 milliseconds. 
 The best way to optimize this is to start from a relatively large partition (e.g., yearly or no partition at all if data permits), 
 check what the [flame graph][ref-flame-graph] in Query History shows, then iterate as needed.
 

docs/pages/product/configuration/reference/environment-variables.mdx

@@ -1305,6 +1305,26 @@ If `true`, the DAX API will expose time dimensions as calendar hierarchies.
 | --------------- | ---------------------- | --------------------- |
 | `true`, `false` | `true` | `true` |
 
+## `CUBE_XMLA_LANGUAGE`
+
+This variable is used to [configure the locale][ref-mdx-api-locale] for the [MDX API][ref-mdx-api]. 
+
+| Possible Values | Default in Development | Default in Production |
+| --------------- | ---------------------- | --------------------- |
+| Either a [LCID][link-lcid] (numeric) or a language tag (string) | `1033` (English - United States) | `1033` (English - United States) |
+
+For example, to display currency values using the Netherlands locale (euro with comma as decimal separator), you can use either:
+
+```bash
+# LCID
+CUBE_XMLA_LANGUAGE=1043
+
+# Language tag
+CUBE_XMLA_LANGUAGE=nl-NL
+```
+
+[link-lcid]: https://learn.microsoft.com/en-us/openspecs/windows_protocols/ms-lcid/70feba9f-294e-491e-b6eb-56532684c37f
+
 ## `CUBEJS_NESTED_FOLDERS_DELIMITER`
 
 Specifies the delimiter used to flatten the names of nested [folder][ref-folders] in
@@ -1809,3 +1829,5 @@ The port for a Cube deployment to listen to API connections on.
 [ref-dataviz-tools]: /product/configuration/visualization-tools
 [ref-context-to-app-id]: /product/configuration/reference/config#context_to_app_id
 [ref-environments]: /product/workspace/environments
+[ref-mdx-api]: /product/apis-integrations/mdx-api
+[ref-mdx-api-locale]: /product/apis-integrations/mdx-api#measure-format

docs/plugins/link-environment-variables.mjs

@@ -7,6 +7,7 @@ const isCubeEnvVar = (value) => {
     "CUBEJS_",
     "CUBESTORE_",
     "CUBESQL_",
+    "CUBE_",
   ]
 
   return (