docs: accessibility section text cleanup

[hellogreg]

What I did

Content page

1. Improved alt text sample text ("Jimmy Stewart acting alongside costars Donna Reed and Karolyn Grimes in It’s a Wonderful Life"). link to DP
2. Replaced errant period with comma ("video, audio, and canvas"). link to DP
3. Added periods after list items in Microcopy section, for consistency across the page. link to DP
4. Fixed the list item bullet levels in the page outline example. link to DP

Development page

1. Changed "Smashing Magaine" to "Smashing Magazine" (including in the link URL). link to DP
2. Updated WCAG 2.1 references to 2.2. (Do an in-page search for "2.1" at the Development page DP and confirm that that string only appears for success criteria 2.1.1 and 2.1.2, and not for WCAG version 2.1)

axe and aXe to Axe

Deque finally got rid of their weird, inconsistent capitalization. It's all now just "Axe." So I updated some pages to match this at the following pages.

1. Resources page
2. Accessibility tools page
3. CI-CD page

Testing Instructions

1. Confirm all updates match the above listed changes.

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Size Change: 0 B

Total Size: 260 kB

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