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Help/documentation for ÷= is broken #41589

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Description

When running ?÷= in the REPL, the lookup fails with this error:

help?> ÷=
ERROR: LoadError: StringIndexError: invalid index [2], valid nearby indices [1]=>'÷', [3]=>'='
Stacktrace:
 [1] string_index_err(s::String, i::Int64)
   @ Base ./strings/string.jl:12
 [2] getindex
   @ ./strings/string.jl:263 [inlined]
 [3] lookup_doc(ex::Symbol)
   @ REPL /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.6/REPL/src/docview.jl:224
 [4] docm(source::LineNumberNode, mod::Module, ex::Any)
   @ Base.Docs ./docs/Docs.jl:521
 [5] var"@doc"(__source__::LineNumberNode, __module__::Module, x::Vararg{Any, N} where N)
   @ Core ./boot.jl:508
in expression starting at /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.6/REPL/src/docview.jl:466

The error is a little confusing, since it doesn't seem that it can't find the documentation, but rather, it fails to index into the string "÷=".

Version info:

julia> versioninfo()
Julia Version 1.6.2
Commit 1b93d53fc4 (2021-07-14 15:36 UTC)
Platform Info:
  OS: Linux (x86_64-pc-linux-gnu)
  CPU: Intel(R) Core(TM) i5-9300H CPU @ 2.40GHz
  WORD_SIZE: 64
  LIBM: libopenlibm
  LLVM: libLLVM-11.0.1 (ORCJIT, skylake)
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