replace.py and pagegenerators.py help improvements

- Move documentation of fixes from replace script into fixes module.
- Remove duplicate -page argument documentation in replace script.
- Add periods where missing in pagegenerators help.
- remove ?? from -help.

Change-Id: I8a3f83c319c3847673e994a433e128b5f4161862
Merge "replace.py and pagegenerators.py help improvements"