docs: Fix discrepancies between v0.8 spec/docs and schemas (#556)

Author: jacobsimionato

docs/reference/components.md

@@ -91,7 +91,7 @@ Display icons using Material Icons or custom icon sets.
   "id": "check-icon",
   "component": {
     "Icon": {
-      "name": {"literalString": "check_circle"}
+      "name": {"literalString": "check"}
     }
   }
 }
@@ -169,7 +169,7 @@ Boolean toggle.
 {
   "id": "terms-checkbox",
   "component": {
-    "Checkbox": {
+    "CheckBox": {
       "label": {"literalString": "I agree to the terms"},
       "value": {"path": "/form/agreedToTerms"}
     }

specification/v0_8/docs/custom_catalog_changes.md

@@ -45,7 +45,7 @@ Your responsibilities are to accurately declare your capabilities and render sur
 
 1.  **Declare capabilities on every request**: For every A2A message your application sends, your library must inject the `a2uiClientCapabilities` object into the top-level `metadata` field.
 
-2.  **Populate `supportedCatalogIds`**: In the capabilities object, populate this array with the string identifiers of all pre-compiled catalogs your renderer supports. If your renderer supports the standard catalog for v0.8, you **should** include its ID: `a2ui.org:standard_catalog_0_8_0`.
+2.  **Populate `supportedCatalogIds`**: In the capabilities object, populate this array with the string identifiers of all pre-compiled catalogs your renderer supports. If your renderer supports the standard catalog for v0.8, you **should** include its ID: `https://github.com/google/A2UI/blob/main/specification/v0_8/json/standard_catalog_definition.json`.
 
 3.  **Provide `inlineCatalogs` (optional)**: If your renderer supports dynamically generating or defining catalogs at runtime, include their full, valid Catalog Definition Documents in the `inlineCatalogs` array.
 

specification/v0_8/json/a2ui_client_capabilities_schema.json

@@ -6,7 +6,7 @@
   "properties": {
     "supportedCatalogIds": {
       "type": "array",
-      "description": "The URI of each of the catalogs that is supported by the client. The standard catalog for v0.8 is 'a2ui.org:standard_catalog_0_8_0'.",
+      "description": "The URI of each of the catalogs that is supported by the client. The standard catalog for v0.8 is 'https://github.com/google/A2UI/blob/main/specification/v0_8/json/standard_catalog_definition.json'.",
       "items": {
         "type": "string"
       }

specification/v0_8/json/server_to_client.json

@@ -15,7 +15,7 @@
         },
         "catalogId": {
           "type": "string",
-          "description": "The identifier of the component catalog to use for this surface. If omitted, the client MUST default to the standard catalog for this A2UI version (a2ui.org:standard_catalog_0_8_0)."
+          "description": "The identifier of the component catalog to use for this surface. If omitted, the client MUST default to the standard catalog for this A2UI version (https://github.com/google/A2UI/blob/main/specification/v0_8/json/standard_catalog_definition.json)."
         },
         "root": {
           "type": "string",