doc(algebra/big_operators): fix formatting of library note (#6261)

The name of a library note is already used as its title: <https://leanprover-community.github.io/mathlib_docs_demo/notes.html#operator%20precedence%20of%20big%20operators>
leanprover-community · Feb 16, 2021 · 2411d68 · 2411d68
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commit 2411d68
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diff --git a/src/algebra/big_operators/basic.lean b/src/algebra/big_operators/basic.lean
@@ -49,8 +49,6 @@ rfl
 end finset
 
 /--
-## Operator precedence of `∏` and `∑`
-
 There is no established mathematical convention
 for the operator precedence of big operators like `∏` and `∑`.
 We will have to make a choice.