Rollup merge of #113145 - joshtriplett:style-guide-document-assignment-newlines, r=joshtriplett

style-guide: Document newline rules for assignment operators

The style guide gives general rules for binary operators including
assignment, and one of those rules says to put the operator on the
subsequent line; the style guide needs to explicitly state the exception
of breaking *after* assignment operators rather than before.

This is already what rustfmt does and what users do; this fixes the
style guide to match the expected default style.

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