Fix typo (panick -> panic)

[WaffleLapkin]

Fix typo (panick -> panic) in std::error module docs.

[rust-highfive]

Hey! It looks like you've submitted a new PR for the library teams!

If this PR contains changes to any rust-lang/rust public library APIs then please comment with r? rust-lang/libs-api @rustbot label +T-libs-api -T-libs to request review from a libs-api team reviewer. If you're unsure where your change falls no worries, just leave it as is and the reviewer will take a look and make a decision to forward on if necessary.

Examples of T-libs-api changes:

• Stabilizing library features
• Introducing insta-stable changes such as new implementations of existing stable traits on existing stable types
• Introducing new or changing existing unstable library APIs (excluding permanently unstable features / features without a tracking issue)
• Changing public documentation in ways that create new stability guarantees
• Changing observable runtime behavior of library APIs

[rust-highfive]

r? @Mark-Simulacrum

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[Dylan-DPC]

@bors r+ rollup

[bors]

📌 Commit f344d56 has been approved by Dylan-DPC

[bors]

⌛ Testing commit f344d56 with merge 28b8919...

[bors]

☀️ Test successful - checks-actions
Approved by: Dylan-DPC
Pushing 28b8919 to master...

[rust-timer]

Finished benchmarking commit (28b8919): comparison url.

Instruction count

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

Max RSS (memory usage)

Results

• Primary benchmarks: 😿 relevant regression found
• Secondary benchmarks: mixed results

	mean1	max	count2
Regressions 😿 (primary)	6.2%	6.2%	1
Regressions 😿 (secondary)	3.1%	3.1%	1
Improvements 🎉 (primary)	N/A	N/A	0
Improvements 🎉 (secondary)	-3.3%	-5.9%	5
All 😿🎉 (primary)	6.2%	6.2%	1

Cycles

Results

• Primary benchmarks: 🎉 relevant improvement found
• Secondary benchmarks: no relevant changes found

	mean1	max	count2
Regressions 😿 (primary)	N/A	N/A	0
Regressions 😿 (secondary)	N/A	N/A	0
Improvements 🎉 (primary)	-2.2%	-2.2%	1
Improvements 🎉 (secondary)	N/A	N/A	0
All 😿🎉 (primary)	-2.2%	-2.2%	1

If you disagree with this performance assessment, please file an issue in rust-lang/rustc-perf.

@rustbot label: -perf-regression

Footnotes

1. the arithmetic mean of the percent change ↩ ↩²

2. number of relevant changes ↩ ↩²