query/plumbing: adjust comment to reality

[RalfJung]

The limit for the query key size got changed recently in f51ec11 but the comment was not updated.

Though maybe it is time to intern CanonicalTypeOpAscribeUserTypeGoal rather than copying it everywhere?

r? @lcnr

[compiler-errors]

@bors r+ rollup

[bors]

📌 Commit c8058c8 has been approved by compiler-errors

It is now in the queue for this repository.

[bors]

⌛ Testing commit c8058c8 with merge 3a258d1...

[bors]

☀️ Test successful - checks-actions
Approved by: compiler-errors
Pushing 3a258d1 to master...

[rust-timer]

Finished benchmarking commit (3a258d1): comparison URL.

Overall result: ❌ regressions - no action needed

@rustbot label: -perf-regression

Instruction count

This is the most reliable metric that we have; it was used to determine the overall result at the top of this comment. However, even this metric can sometimes exhibit noise.

	mean	range	count
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	3.8%	[3.8%, 3.8%]	1
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	-	-	0

Max RSS (memory usage)

Results (primary -2.7%)

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
Improvements ✅ (primary)	-2.7%	[-3.1%, -2.3%]	2
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	-2.7%	[-3.1%, -2.3%]	2

Cycles

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

Binary size

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

Bootstrap: 785.591s -> 786.407s (0.10%)
Artifact size: 335.31 MiB -> 335.32 MiB (0.00%)