docs(path): remove inexistant option

[lowlighter]

The default example on path/README.md is incorrect:

import { globToRegExp } from "https://deno.land/std@$STD_VERSION/path/glob.ts";

globToRegExp("foo/**/*.json", {
  flags: "g",
  extended: true,
  globstar: true,
  caseInsensitive: false,
}); // returns the regex to find all .json files in the folder foo.

It throws an error because flags is not defined on interface:

error: TS2345 [ERROR]: Argument of type '{ flags: string; extended: true; globstar: true; caseInsensitive: false; }' is not assignable to parameter of type 'GlobOptions'.
  Object literal may only specify known properties, and 'flags' does not exist in type 'GlobOptions'.
  flags: "g",
  ~~~~~~~~~~
    at ~/test.ts:4:3

It should be removed since it creates confusion

[wperron]

LGTM, Let's just rebase when #938 lands to fix the type errors on canary

[kt3k]

@lowlighter Thanks!