docs: update API documentation

websites/api.rushstack.io/data/api_nav.json

@@ -4156,6 +4156,11 @@
               "label": "pnpmVerifyStoreIntegrity",
               "id": "pages/rush-lib.environmentconfiguration.pnpmverifystoreintegrity"
             },
+            {
+              "type": "doc",
+              "label": "quietMode",
+              "id": "pages/rush-lib.environmentconfiguration.quietmode"
+            },
             {
               "type": "doc",
               "label": "reset",

websites/api.rushstack.io/docs/pages/rush-lib.environmentconfiguration.md

@@ -394,6 +394,29 @@ boolean \| undefined
 **_(BETA)_** If specified, enables or disables integrity verification of the pnpm store during install. See 
 
 
+</td></tr>
+<tr><td>
+
+[quietMode](./rush-lib.environmentconfiguration.quietmode.md)
+
+
+</td><td>
+
+`static`
+
+`readonly`
+
+
+</td><td>
+
+boolean
+
+
+</td><td>
+
+**_(BETA)_** If `true`<></>, Rush will suppress informational startup messages, equivalent to passing `--quiet`<></>. See 
+
+
 </td></tr>
 <tr><td>
 

websites/api.rushstack.io/docs/pages/rush-lib.environmentconfiguration.quietmode.md

@@ -0,0 +1,22 @@
+---
+hide_title: true
+custom_edit_url: null
+pagination_prev: null
+pagination_next: null
+---
+<!-- Do not edit this file. It is automatically generated by API Documenter. -->
+
+[Home](./index.md) &gt; [@microsoft/rush-lib](./rush-lib.md) &gt; [EnvironmentConfiguration](./rush-lib.environmentconfiguration.md) &gt; [quietMode](./rush-lib.environmentconfiguration.quietmode.md)
+
+## EnvironmentConfiguration.quietMode property
+
+> This API is provided as a beta preview for developers and may change based on feedback that we receive. Do not use this API in a production environment.
+> 
+
+If `true`<></>, Rush will suppress informational startup messages, equivalent to passing `--quiet`<></>. See 
+
+**Signature:**
+
+```typescript
+static get quietMode(): boolean;
+```

websites/api.rushstack.io/docs/pages/rush-lib.environmentvariablenames.md

@@ -44,5 +44,6 @@ EnvironmentVariableNames: {
     readonly _RUSH_LIB_PATH: "_RUSH_LIB_PATH";
     readonly RUSH_INVOKED_FOLDER: "RUSH_INVOKED_FOLDER";
     readonly RUSH_INVOKED_ARGS: "RUSH_INVOKED_ARGS";
+    readonly RUSH_QUIET_MODE: "RUSH_QUIET_MODE";
 }
 ```