[Sync EN] Fix grammar in control structures (#5750)

[lacatoire]

Syncs the Spanish translation with php/doc-en#5750 (commit e674990).

• include-once.xml, include.xml, match.xml, switch.xml: the touched paragraphs become simpara, as in EN.
• foreach.xml: the warning now refers to a single reference to the $value of the last element ("destruirla"), and the note about array destructuring ends with a period.
• switch.xml: the introduction follows the reworded English text (a series of if statements on the same expression; switch is often more convenient and easier to read), and the alternative if-else blocks form a complete sentence.
• match.xml: "OU lógico" typo fixed to "O lógico", indentation of the UnhandledMatchError paragraph fixed.
• do-while.xml, elseif.xml, for.xml: English-only grammar fixes, the Spanish text already matched, so only EN-Revision is bumped.
• EN-Revision updated in the eight files.

Fixes: #965

Also aligns one paragraph of include.xml (functions defined in the included file) with the simpara used in doc-en, which the structure check requires.