Added some function arguments to the documentation for FuncAnimation
Fix mpl_toolkits hyperlinks
Fix hyperlinks to pylab_examples
Remove dregs of nxutils
Fixed backend workflow.
Merge pull request #3004 from mdboom/docs-nxutils

FAQ and unit/ still refers to nxutils
Merge pull request #3246 from dmcdougall/fix-doc-links

Fix some hyperlinks in the documentation

Edits only in rst files
Merge pull request #3243 from pelson/nbagg_proper

Fixed backend workflow.
Merge pull request #3217 from JulianCienfuegos/master

Added some function arguments to the documentation for FuncAnimation