Merge branch 'en/merge-strategy-docs' into maint

Merge branch 'en/merge-strategy-docs' into maint

Documentation updates.

* en/merge-strategy-docs:
  Update error message and code comment
  merge-strategies.txt: add coverage of the `ort` merge strategy
  git-rebase.txt: correct out-of-date and misleading text about renames
  merge-strategies.txt: fix simple capitalization error
  merge-strategies.txt: avoid giving special preference to patience algorithm
  merge-strategies.txt: do not imply using copy detection is desired
  merge-strategies.txt: update wording for the resolve strategy
  Documentation: edit awkward references to `git merge-recursive`
  directory-rename-detection.txt: small updates due to merge-ort optimizations
  git-rebase.txt: correct antiquated claims about --rebase-merges