Fix: PUT documentation

[glensc]

There is no $_PUT superglobal in PHP.

Existing docs refer to it as PUT stream:

• https://docs.phalcon.io/4.2/request/#put

[glensc]

Uh, this needs to be done in source code:

• https://github.com/phalcon/cphalcon/pull/16707

[glensc]

Keepin this open, until the change is applied in this repo via generation