Guides, web, php.md for 8: (#2954)

* strip out all of the Rocky 9 content
* update the module for php to the latest for Rocky 8
* passive voice converted to active voice on most phrases
* simplification of some sentences
* replace most contractions with words
* processes and system files in back ticks
* most "we" use converted to "you"
* other minor corrections

Author: sspencerwire