Fix various wording, punctuation, and capitalization issues

Tom Tom requested to merge tomtomtom/docs-krita-org:tomtomtom/fixwording into master

This merge request fixes a lot of wording, punctuation, and capitalizations issues, mostly focusing on the blending mode pages. They're still not perfect: Most notably I'm not fully sure what the descriptions for Darken/Lighten, Fog Darken/Lighten, Pin Light, and Shade are trying to say, so they're still a bit mangled.

Edited by Tom Tom

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