fix link check for new macOS heading (maybe, hopefully)

Author: Daniel D. Beck

scripts/linkmonitor/inventory.yaml

@@ -64,6 +64,7 @@
   guides/index.html#guides, guides/installing-scientific-packages.html, guides/installing-scientific-packages.html#building-from-source,
   guides/installing-scientific-packages.html#contents, guides/installing-scientific-packages.html#installing-scientific-packages,
   guides/installing-scientific-packages.html#linux-distribution-packages, guides/installing-scientific-packages.html#mac-os-x-installers-and-package-managers,
+  guides/installing-scientific-packages.html#macos-installers-and-package-managers,
   guides/installing-scientific-packages.html#numpy-and-the-science-stack, guides/installing-scientific-packages.html#scipy-distributions,
   guides/installing-scientific-packages.html#spack, guides/installing-scientific-packages.html#the-conda-cross-platform-package-manager,
   guides/installing-scientific-packages.html#windows-installers, guides/installing-using-linux-tools.html,