Fix typos and grammar in documentation files #2
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The technical change: "Replacing HTML links with Markdown format"(book/src/background/gkr.md)
The reason for the change: "since the last link doesn't work on GitHub"

./memory-checking.html - ./memory-checking.md
Before:
Additional improvements: "Fixing typographical and punctuation errors"
1. Changed "nuisances" to "nuances" (more accurate word choice)
2. Fixed spelling: "accumluate" to "accumulate"
3. Fixed "lik" to "like"
4. Added missing parenthesis
5. Corrected "this the proof" to "this is the proof"
6. Grammar fix: "Each of the modules do" to "Each of the modules does"
7. Changed "flush these out" to "flesh these out" (correct idiom)
8. Fixed spelling: "efficienct" to "efficient"
9. Corrected name spelling: "Cramar" to "Cramer"
10. Fixed spelling: "Ciruict" to "Circuit"
11. Corrected "happend" to "happen"