[std.iterator.tags] Reword iterator tag description #6840
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Related to #5641.
This section has a few issues:
It contains wording "so that the function can select". This doesn't make much sense, since a function simply exists and never selects in itself. The intent is presumably that a function call selects the most efficient algorithm. That's how tag dispatch works anyway.
The wording contains "compile time", which isn't a concept that really exists in C++. It is better to talk about overload resolution.