* find: various improvements
The information content of the page should be unchanged, but hopefully it's now easier to read
(and respects our length recommendations of 8 maximum examples).
The changes include:
- Make the `-mtime` example more intuitive, so it only needs to be shown once,
and combine the `-delete` option with the first (now only) `-mtime` example
(thus reducing the page size back to 8 examples)
- Fix a comma splice in the `-exec` example, and a missing "a" in the `-path` example
- Reorder the examples to provide a more consistent and intuitive sequence
(e.g. by introducing `-iname` in an earlier example, and moving the `-exec` command down)
* clarify -size example description
Due to the limit of 8 entries, we need to remove one entry to add the search by directory name. The -or conditional example is probably less useful, so it's being removed.
* find path while excluding certain directory
* delete the `find {{root_path}} -empty` command to meet the demand of 8 commands at most
* tokenize the demo parameter