update docs to use the newer FetchContent instead of the older ExternalProject_Add #821
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Description
Updated the documentation for using doctest with CMake via the newer
FetchContent
instead of the olderExternalProject_Add
.I was looking for this exact documentation and was unable to find it in the docs. I did find #698 with the information I wanted but it was a year old so I made the PR myself.
GitHub Issues
Closes #698