Add headers for each of the missing Log/Writer implementations
Add section on using ChromePHP Log Writer
Update zend.log.writers.rst

Typo fix
Update zend.log.writers.rst

Missed one
Merge pull request #1256 from monkeyphp/fix/zend.log.writers

Add headers for each of the missing Log/Writer implementations
Merge branch 'hotfix/1256' into develop

Close #1256