ExternalProject: Add option subsection anchors for accessibility from TOC

Use RST subsections for each major step of `ExternalProject_Add()`.
This makes finding options easier with less scrolling.
For example, finding important Download vs. Test options etc.

Fixes: #25129
This commit is contained in:
scivision
2023-07-26 12:44:03 -04:00
committed by Brad King
parent 6828b9df5a
commit c949a8742e

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