[docs] GettingStarted: Replace build variant suffix with asterisks in paths to --xcode build artifacts

The default build variant for `--xcode` recently changed from ReleaseAssert to MinSizeRelAssert, and we forgot to update these hardcoded paths. Use asterisks to avoid having to do this again.

Author: AnthonyLatsis

docs/HowToGuides/GettingStarted.md

@@ -360,13 +360,13 @@ several more steps are necessary to set up this environment:
 * Create a new Xcode workspace.
 * Add the generated Xcode projects or Swift packages that are relevant to your
   tasks to your workspace. All the Xcode projects can be found among the
-  build artifacts under `build/Xcode-ReleaseAssert`. For example:
-  * If you are aiming for the compiler, add `build/Xcode-ReleaseAssert/swift-macosx-*/Swift.xcodeproj`.
+  build artifacts under `build/Xcode-*/`. For example:
+  * If you are aiming for the compiler, add `build/Xcode-*/swift-macosx-*/Swift.xcodeproj`.
     This project also includes the standard library and runtime sources. If you
     need the parts of the compiler that are implemented in Swift itself, add the
     `swift/SwiftCompilerSources/Package.swift` package as well.
   * If you are aiming for just the standard library or runtime, add
-    `build/Xcode-ReleaseAssert/swift-macosx-*/stdlib/Swift-stdlib.xcodeproj`.
+    `build/Xcode-*/swift-macosx-*/stdlib/Swift-stdlib.xcodeproj`.
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