docs: restrict-template-expressions - remove mention of numbers being allowed

[llllvvuu]

In the recommended config, numbers are allowed, but so are several other types. In the strict config, numbers are not allowed (#8364). Either way, "string and number" might not be the right documentation for what's allowed.

PR Checklist

N/A - small docs edit

Overview

small docs edit

[typescript-eslint]

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