Rollup merge of #156791 - obi1kenobi:unsafe-kept-in-help-text, r=JonathanBrouwer,Kivooeo

Unsafe kept in help text

Currently when encountering a malformed attribute, the compiler will suggest removing unsafe in the well-formed template even when unsafe is required. This PR preserves whatever unsafe (or lack) exists in the user's code.

r? @jdonszelmann