CDRIVER-670 don't check links in docs

"sphinx-build" linkcheck fails too often to be worthwhile, due GitHub
outages and other problems.

Author: ajdavis

.evergreen/check-release-archive.sh

@@ -9,7 +9,6 @@ sphinx-build --version
 
 ./autogen.sh --enable-html-docs --enable-man-pages --with-snappy=bundled --with-zlib=bundled --with-libbson=bundled
 make distcheck
-sphinx-build -b linkcheck ./doc doc/html
 
 # Check that docs were included, but sphinx temp files weren't.
 tarfile=mongo-c-driver-*.tar.gz