Inline code highlighting has issues

[echasnovski]

There are multiple issues of recognizing inline code blocks. It usually works fine when backticks surround single word consisting from letters. Other than that, not so much.

Text:

`inline code with s`
`inline code with spaces`
`require('')`
`require('mod')`
`{}`

Current behavior with tree-sitter:

Current behavior without tree-sitter:

[justinmk]

should be fixed by #16

[justinmk]

should be fixed by #16

Here's the result with those changes:

(help_file
  (block
    (line
      (codespan
        (word)))
    (line
      (codespan
        (word)))
    (line
      (codespan
        (word)))
    (line
      (codespan
        (word)))
    (line
      (codespan
        (word)))))