PHPLIB-1275: Replace apiargs usage in docs with extracts (mongodb#1203)

Use extracts for option includes and repeated option notes. Order options alphabetically.

Split up index and command options into separate tables.

* Change RST syntax for function and method params

This adds a Parameters section and uses a definition list, which is more consistent with PHPC. It also allows group the options table under the options param.

* Fix BulkWriteResult::getModifiedCount() return type

* Fix position of type map anchor

This was inadvertently moved in 1043a3a

* Use basic paragraphs for Atlas Search notes

* Move Atlas Search requirement note to Definition section

Author: jmikola