doc: fix header level # --> ## in performance-tips.md (#37138)

JuliaLang · Aug 21, 2020 · 5039772 · 5039772
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commit 5039772
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/doc/src/manual/performance-tips.md b/doc/src/manual/performance-tips.md
@@ -1583,7 +1583,7 @@ In the mean time, some user-contributed packages like
 [FastClosures](https://github.com/c42f/FastClosures.jl) automate the
 insertion of `let` statements as in `abmult3`.
 
-# Checking for equality with a singleton
+## Checking for equality with a singleton
 
 When checking if a value is equal to some singleton it can be
 better for performance to check for identicality (`===`) instead of