[Sync-EN] Fix the assert(), dl() and getrusage() return docs and the E_ALL value

[lacatoire]

Syncs four reference/info/ pages with php/doc-en#5650.

• assert(): the return-value list said the function always returns true when assert.exception=1, assert.bail=1, or a custom exception object is passed. Those three entries are removed: only zend.assertions=0, zend.assertions=-1 and assert.active=0 make it unconditionally return true. AssertionError and the three Throwable mentions are marked up as exceptionname.
• dl(): when module loading is unavailable or enable_dl is off, the function emits an E_WARNING and returns false; it does not emit E_ERROR and stop execution.
• get_defined_constants(): the two example outputs showed [E_ALL] => 2047, the pre-8.0 value; it is 30719.
• getrusage(): with mode set to 1 (RUSAGE_CHILDREN) the function collects resource usage for child processes, not for threads via RUSAGE_THREAD.

reference/info/versions.xml is not part of this change: that file is EN-only infrastructure and has no Russian counterpart.

Several paragraphs become simpara, as upstream.

EN-Revision bumped to 5367d2fcdf4b710a81806aba52a71c522f082713 on the four files.

Fixes: #1688