Grab bag of typos and copy corrections

[fturmel]

I had Codex (GTP-6.1 Sol High) review the content files to identify typos, inconsistencies, and other copy-related issues that may have slipped through previous reviews and the Typos automated check.

• Fixed spelling errors, grammar, punctuation, duplicate words, and extra spaces.
• Standardized brand, library, language, and topic names.
• Corrected people’s names, technical terms, and function references.
• Clarified descriptions and kept repeated course summaries consistent.
• Repaired the GitHub issue and Mastodon directory links.
• Renamed recurrsion.png to recursion.png and updated its reference.

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