doc: Copy-edit parameter documentation [PR89915]

I made a pass through the parameter documentation to fix various
issues with grammar, markup, punctuation, capitalization, inconsistent
use of terminology, and so on.  I'm sure there's still room for improvement
but this is at least a step in the right direction.

As internal documentation, the parameter descriptions naturally
contain a lot of jargon and abbreviations for compiler passes.  This
patch does not attempt to fix that.  Probably a more critical area for
future improvement is making it more obvious what pass or part of the
compiler each parameter controls and perhaps adding some additional
subsectioning to group them.

gcc/ChangeLog
	PR translation/89915
	* doc/params.texi: Copy-edit text throughout the file.
	* params.opt: Likewise in documentation strings.

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