Remove unneeded unknown variable and Symbol creation when iterating over items in rustdoc rendering

[GuillaumeGomez]

I realized that we were creating a Symbol but never actually used it since we check that item.name is always Some().

r? @notriddle

[GuillaumeGomez]

Ah, new rustfmt version comes with new changes. Well, rebased and fixed.

[notriddle]

@bors r+ rollup

[bors]

📌 Commit 1e55fc1 has been approved by notriddle

It is now in the queue for this repository.

[bors]

⌛ Testing commit 1e55fc1 with merge 10a98e8...

[bors]

☀️ Test successful - checks-actions
Approved by: notriddle
Pushing 10a98e8 to master...

[rust-timer]

Finished benchmarking commit (10a98e8): 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

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)	2.8%	[2.1%, 3.9%]	3
Regressions ❌ (secondary)	4.3%	[3.9%, 4.5%]	3
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	2.8%	[2.1%, 3.9%]	3

Cycles

Results

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)	-	-	0
Improvements ✅ (secondary)	-2.8%	[-3.1%, -2.5%]	2
All ❌✅ (primary)	-	-	0

Binary size

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

Bootstrap: 676.64s -> 676.234s (-0.06%)
Artifact size: 313.81 MiB -> 313.80 MiB (-0.01%)