consistent casing in code samples

Author: ethanpalm

navigation.mdx

@@ -118,7 +118,7 @@ In the `navigation` object, `tabs` is an array where each entry is an object tha
   "navigation": {
     "tabs": [
       {
-        "tab": "API References",
+        "tab": "API reference",
         "icon": "square-terminal",
         "pages": [
           "api-reference/get",
@@ -221,7 +221,7 @@ In the `navigation` object, `anchors` is an array where each entry is an object
         ]
       },
       {
-        "anchor": "API References",
+        "anchor": "API reference",
         "icon": "square-terminal",
         "pages": [
           "api-reference/get",
@@ -294,7 +294,7 @@ In the `navigation` object, `dropdowns` is an array where each entry is an objec
         ]
       },
       {
-        "dropdown": "API References",
+        "dropdown": "API reference",
         "icon": "square-terminal",
         "pages": [
           "api-reference/get",
@@ -370,7 +370,7 @@ In the `navigation` object, `versions` is an array where each entry is an object
         "version": "1.0.0",
         "groups": [
           {
-            "group": "Getting Started",
+            "group": "Getting started",
             "pages": ["v1/overview", "v1/quickstart", "v1/development"]
           }
         ]
@@ -379,7 +379,7 @@ In the `navigation` object, `versions` is an array where each entry is an object
         "version": "2.0.0",
         "groups": [
           {
-            "group": "Getting Started",
+            "group": "Getting started",
             "pages": ["v2/overview", "v2/quickstart", "v2/development"]
           }
         ]
@@ -432,7 +432,7 @@ We currently support the following languages:
         "language": "en",
         "groups": [
           {
-            "group": "Getting Started",
+            "group": "Getting started",
             "pages": ["en/overview", "en/quickstart", "en/development"]
           }
         ]
@@ -441,7 +441,7 @@ We currently support the following languages:
         "language": "es",
         "groups": [
           {
-            "group": "Getting Started",
+            "group": "Getting started",
             "pages": ["es/overview", "es/quickstart", "es/development"]
           }
         ]