Add more documentation for rustc_private

Author: jyn514

crates/rust-analyzer/src/config.rs

@@ -180,10 +180,14 @@ config_data! {
         /// tests or binaries.\nFor example, it may be `--release`.
         runnables_cargoExtraArgs: Vec<String>   = "[]",
 
-        /// Path to the rust compiler sources, for usage in rustc_private projects, or "discover"
-        /// to try to automatically find it. Any project which uses rust-analyzer with the rustcPrivate
+        /// Path to the Cargo.toml of the rust compiler workspace, for usage in rustc_private
+        /// projects, or "discover" to try to automatically find it.
+        ///
+        /// Any project which uses rust-analyzer with the rustcPrivate
         /// crates must set `[package.metadata.rust-analyzer] rustc_private=true` to use it.
-        rustcSource : Option<String> = "null",
+        ///
+        /// This option is not reloaded automatically; you must restart rust-analyzer for it to take effect.
+        rustcSource: Option<String> = "null",
 
         /// Additional arguments to `rustfmt`.
         rustfmt_extraArgs: Vec<String>               = "[]",

docs/user/generated_config.adoc

@@ -107,7 +107,7 @@
 [[rust-analyzer.runnables.cargoExtraArgs]]rust-analyzer.runnables.cargoExtraArgs (default: `[]`)::
  Additional arguments to be passed to cargo for runnables such as  tests or binaries.\nFor example, it may be `--release`.
 [[rust-analyzer.rustcSource]]rust-analyzer.rustcSource (default: `null`)::
- Path to the rust compiler sources, for usage in rustc_private projects, or "discover"  to try to automatically find it. Any project which uses rust-analyzer with the rustcPrivate  crates must set `[package.metadata.rust-analyzer] rustc_private=true` to use it.
+ Path to the Cargo.toml of the rust compiler workspace, for usage in rustc_private  projects, or "discover" to try to automatically find it.   Any project which uses rust-analyzer with the rustcPrivate  crates must set `[package.metadata.rust-analyzer] rustc_private=true` to use it.   This option is not reloaded automatically; you must restart rust-analyzer for it to take effect.
 [[rust-analyzer.rustfmt.extraArgs]]rust-analyzer.rustfmt.extraArgs (default: `[]`)::
  Additional arguments to `rustfmt`.
 [[rust-analyzer.rustfmt.overrideCommand]]rust-analyzer.rustfmt.overrideCommand (default: `null`)::

editors/code/package.json

@@ -713,7 +713,7 @@
                     }
                 },
                 "rust-analyzer.rustcSource": {
-                    "markdownDescription": "Path to the rust compiler sources, for usage in rustc_private projects, or \"discover\" to try to automatically find it. Any project which uses rust-analyzer with the rustcPrivate crates must set `[package.metadata.rust-analyzer] rustc_private=true` to use it.",
+                    "markdownDescription": "Path to the Cargo.toml of the rust compiler workspace, for usage in rustc_private projects, or \"discover\" to try to automatically find it.    Any project which uses rust-analyzer with the rustcPrivate crates must set `[package.metadata.rust-analyzer] rustc_private=true` to use it.    This option is not reloaded automatically; you must restart rust-analyzer for it to take effect.",
                     "default": null,
                     "type": [
                         "null",