doc: fix doc styles
Same with #13066. Fix markdown linter(#12756) warnings.
Summary
BUILDING.md
- L122: Missing code-language flag
- L170: Strong should use
*
as a marker
doc/changelogs/CHANGELOG_V6.md
- L1494: Don’t pad
emphasis
with inner spaces
doc/guides/maintaining-V8.md
- L3: Don’t use multiple top level headings
- L16: Don’t use multiple top level headings
- L40: Don’t use multiple top level headings
- L124: Don’t use multiple top level headings
- L182: Missing code-language flag
- L223: Don’t use multiple top level headings
- L288: Don’t use multiple top level headings
- L307: Don’t use multiple top level headings
doc/guides/writing-tests.md
- L322: Missing code-language flag
- L329: Missing code-language flag
doc/releases.md
- L299: Missing code-language flag
Checklist
-
make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
documentation is changed or added -
commit message follows commit guidelines
Affected core subsystem(s)
doc