fixup! doc: document wildcard supported by tools/test.py

Author: joyeecheung

BUILDING.md

@@ -358,6 +358,7 @@ with `test-stream-`:
 
 ```bash
 tools/test.py test/parallel/test-stream-*
+tools/test.py parallel/test-stream-*  # The test/ prefix can be omitted
 # In some shell environments, you may need to quote the pattern
 tools/test.py "test/parallel/test-stream-*"
 ```
@@ -368,7 +369,8 @@ with a name that starts with `test-inspector-`, regardless of the directory they
 ```bash
 # Matches test/sequential/test-inspector-*, test/parallel/test-inspector-*,
 # test/known_issues/test-inspector-*, etc.
-tools/test.py test/*/test-inspector-*
+tools/test.py "test/*/test-inspector-*"
+tools/test.py "*/test-inspector-*"  # The test/ prefix can be omitted
 ```
 
 If you want to check the other options, please refer to the help by using