Minor improvements to zpoolconcepts.7

[dodexahedron]

Mostly grammatical consistency/fixes for zpoolconcepts.7, and some minor clarification.

Motivation and Context

I noticed incorrect use of "effects" when looking at the man page and decided to include some other minor improvements to grammar, clarity, and consistency while I was fixing that.

Description

• Fixed a typo (effects -> affects)
• Re-worded raidz description to make it clearer that it is not quite the same as RAID5, though similar
• Clarified that data is not necessarily written in a static stripe width
• Minor grammar consistency improvement
• Noted that "volumes" means zvols
• Fixed a couple of split infinitives
• "we" -> ZFS

How Has This Been Tested?

Documentation changes only. No code changes.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Performance enhancement (non-breaking change which improves efficiency)
• Code cleanup (non-breaking change which makes code smaller or more readable)
• Breaking change (fix or feature that would cause existing functionality to change)
• Library ABI change (libzfs, libzfs_core, libnvpair, libuutil and libzfsbootenv)
• Documentation (a change to man pages or other documentation)

Checklist:

• My code follows the OpenZFS code style requirements.
• I have updated the documentation accordingly.
• I have read the contributing document.
• I have added tests to cover my changes.
• I have run the ZFS Test Suite with this change applied.
• All commit messages are properly formatted and contain [Signed-off-by]

[dodexahedron]

Minor documentation update to the zpoolconcepts.7 man page.
The only "important" part of it is fixing the improper use of "effects," which should be "affects," in this case.
Other changes made were either to be more consistent (such as insertion of commas to more closely match the style of the rest of the document), or to fix some awkward grammatical constructs, such as odd verb conjugations, and minor clarification on a couple of points.

There was also an instance of "can not" that I changed to "cannot," as those two terms have subtly different meaning, and "cannot" was the intended meaning. "Can not" can be interpreted to mean that something is possible to not be done. "Cannot" unambiguously means that it is impossible to do that thing.

[ceedriic]

The only "important" part of it is fixing the improper use of "effects," which should be "affects," in this case.

Why improper and important? Not a native speaker, but looking at Oxford dictionary, it seems "effects", used as a verb, is perfectly fine here.

[dodexahedron]

"Effects" actually makes little to no sense in that sentence, as used.

"Effects," as a verb, means "causes" or "creates." The intent of that sentence is to say that it alters the capacity and IOPS. "Affects" is the appropriate word for that usage.

[behlendorf]

Thanks for making a pass over this. Generally looks good to me aside from my one DRAID comment.