Docs: enhance scripts comments (#13842)

Author: MojtabaHs

scripts/cpplint.py

@@ -1256,7 +1256,7 @@ def __init__(self):
     self._filters_backup = self.filters[:]
     self.counting = 'total'  # In what way are we counting errors?
     self.errors_by_category = {}  # string to int dict storing error counts
-    self.quiet = False  # Suppress non-error messagess?
+    self.quiet = False  # Suppress non-error messages?
 
     # output format:
     # "emacs" - format that emacs can parse (default)

scripts/style.sh

@@ -95,7 +95,7 @@ clang_options=(-style=file)
 
 # Swift formatting options for the repo should be configured in
 # https://github.com/firebase/firebase-ios-sdk/blob/main/.swiftformat.
-# These may be overriden with additional `.swiftformat` files in subdirectories.
+# These may be overridden with additional `.swiftformat` files in subdirectories.
 swift_options=()
 
 if [[ $# -gt 0 && "$1" == "test-only" ]]; then