Fix typo.

Co-authored-by: Eric Knibbe <[email protected]>

Library/Homebrew/tap.rb

@@ -75,7 +75,7 @@ def self.fetch(user, repo = T.unsafe(nil))
  cache.fetch(cache_key) { |key| cache[key] = new(user, repo) }
  end
 
- # Get a {Tap} from it's path or a path inside of it.
+ # Get a {Tap} from its path or a path inside of it.
  #
  # @api public
  def self.from_path(path)