Change #286704

Comments

INSTALL.md: various updates and improvements
- document missing CA options.
- delete an obsolete Windows sections.
- refresh Schannel on old Windows section, also in 2 other doc
  instances.
- update TLS backend coexist paragraph.
- use active voice more.
- point another section to the CMake document.
- delete stale section about lwIP on Windows.
- drop redundant words.
- shell code correctness and tidy-ups.
- Markdownify where missing.
- pyspelling: allow "CDNs"
- fold long line.

Assisted-by: Jay Satiro

Closes #23455

Changed files

• .github/scripts/pyspelling.words
• docs/INSTALL.md
• docs/SSL-PROBLEMS.md
• projects/Windows/README.md