gopls/internal/settings: update stale documentation for "symbolScope"

The docstring for the "symbolScope" setting is a relic from when we
attempted to make "workspace" the default value, but the default was
subsequently reverted to "all". Update the docstring to not assume a
default.

Change-Id: Ib97b9e7f40227067dedb87700ea7c19bb2758660
Reviewed-on: https://go-review.googlesource.com/c/tools/+/578935
Reviewed-by: Hyang-Ah Hana Kim <[email protected]>
LUCI-TryBot-Result: Go LUCI <[email protected]>
Auto-Submit: Robert Findley <[email protected]>

Author: findleyr

gopls/doc/settings.md

@@ -489,10 +489,9 @@ Default: `"Dynamic"`.
 ##### **symbolScope** *enum*
 
 symbolScope controls which packages are searched for workspace/symbol
-requests. The default value, "workspace", searches only workspace
-packages. The legacy behavior, "all", causes all loaded packages to be
-searched, including dependencies; this is more expensive and may return
-unwanted results.
+requests. When the scope is "workspace", gopls searches only workspace
+packages. When the scope is "all", gopls searches all loaded packages,
+including dependencies and the standard library.
 
 Must be one of:
 

gopls/internal/settings/api_json.go

@@ -339,10 +339,9 @@ type NavigationOptions struct {
 	SymbolStyle SymbolStyle `status:"advanced"`
 
 	// SymbolScope controls which packages are searched for workspace/symbol
-	// requests. The default value, "workspace", searches only workspace
-	// packages. The legacy behavior, "all", causes all loaded packages to be
-	// searched, including dependencies; this is more expensive and may return
-	// unwanted results.
+	// requests. When the scope is "workspace", gopls searches only workspace
+	// packages. When the scope is "all", gopls searches all loaded packages,
+	// including dependencies and the standard library.
 	SymbolScope SymbolScope
 }