Update fix grammar instructions

Author: VioletM

docs/tools/README.md

@@ -55,5 +55,8 @@ This script will run all (or selected) docs markdown files through the open ai a
 python fix_grammar_gpt.py
 
 # Fix grammar for all files that have the string "walkthrough" in the filepath
-python check_embedded_snippets.py -f walkthrough
+python fix_grammar_gpt.py -f walkthrough
+
+# Fix grammar for the particular file
+python fix_grammar_gpt.py -f ../website/docs/intro.md
 ```

docs/tools/fix_grammar_gpt.py

@@ -41,7 +41,7 @@
     parser.add_argument(
         "-f",
         "--files",
-        help="Filter .md files to files containing this string in filename",
+        help="Specify the file name. Grammar Checker will filter all .md files containing this string in the filepath.",
         type=str,
     )