Fix a few doc comment for compiler-interal API docs.

[aDotInTheVoid]

They only used // instead of /// so weren't picked up by rustdoc.

r? @Nilstrieb

[rustbot]

Some changes occurred to MIR optimizations

cc @rust-lang/wg-mir-opt

[Noratrieb]

[bors]

📌 Commit f763d62 has been approved by Nilstrieb

It is now in the queue for this repository.

[bors]

⌛ Testing commit f763d62 with merge 9a21ac8...

[bors]

☀️ Test successful - checks-actions
Approved by: Nilstrieb
Pushing 9a21ac8 to master...

[rust-timer]

Finished benchmarking commit (9a21ac8): comparison URL.

Overall result: no relevant changes - no action needed

@rustbot label: -perf-regression

Instruction count

This benchmark run did not return any relevant results for this metric.

Max RSS (memory usage)

Results (primary -0.9%, secondary -0.0%)

This is a less reliable metric that may be of interest but was not used to determine the overall result at the top of this comment.

	mean	range	count
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	0.5%	[0.5%, 0.5%]	1
Improvements ✅ (primary)	-0.9%	[-0.9%, -0.9%]	1
Improvements ✅ (secondary)	-0.6%	[-0.6%, -0.6%]	1
All ❌✅ (primary)	-0.9%	[-0.9%, -0.9%]	1

Cycles

Results (secondary 0.7%)

This is a less reliable metric that may be of interest but was not used to determine the overall result at the top of this comment.

	mean	range	count
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	0.7%	[0.6%, 0.8%]	2
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	-	-	0

Binary size

This benchmark run did not return any relevant results for this metric.

Bootstrap: 698.211s -> 699.651s (0.21%)
Artifact size: 328.34 MiB -> 328.26 MiB (-0.02%)