checkdoc-symbol-words is a variable defined in `checkdoc.el'.
Its value is
This variable is safe as a file local variable if its value
satisfies the predicate `checkdoc-list-of-strings-p'.
A list of symbol names (strings) which also happen to make good words.
These words are ignored when unquoted symbols are searched for.
This should be set in an Emacs Lisp file's local variables.
You can customize this variable.