Those I found while working on #52952.

Those I found while working on #52952.

Those I found while working on #52952.

(cherry picked from commit a0d55cd)

A few stragglers.

Backported PRs:
- [x] #53091 <!-- Ensure elision of `require_one_based_indexing` with
high-dim array views -->
- [x] #53117 <!-- Try to fix incorrect documentation of `nthreads` -->
- [x] #52855 <!-- Fix variable name in scaling an `AbstractTriangular`
with zero alpha -->
- [x] #52952 <!-- [REPLCompletions] enable completions for `using
Module.Inner|` -->
- [x] #53101 <!-- Inplace transpose for unit Triangular may skip
diagonal -->

Need manual backport:
- [ ] #52505 <!-- fix alignment of emit_unbox_store copy -->

Non-merged PRs with backport label:
- [ ] #53125 <!-- coverage: count coverage where explicitly requested by
inference only -->
- [ ] #52694 <!-- Reinstate similar for AbstractQ for backward
compatibility -->
- [ ] #51479 <!-- prevent code loading from lookin in the versioned
environment when building Julia -->

…Lang#52952)

(cherry picked from commit a0d55cd)