matplotlib / matplotlib Public

Fix nav link for "Usage guide" and remove release/date info from that page

… page

The release and date are already shown on the new top-level contents
page.

DOC: Add links to intro videos

Co-authored-by: Aitik Gupta <aitikgupta@gmail.com>

Parametrize/simplify test_missing_psfont.

DOC: Use correct confidence interval in example prose

DOC: Compress comments in make_image.

make_image is a huge function; shorten it (in physical screen space) a
bit by rewriting/rewrapping some comments, and a few small stylistic
changes.

Missed this one somehow...

Fix more edge cases in psd, csd.

See table here: https://journals.plos.org/plosone/article/figure?id=10.1371/journal.pone.0118537.t001

intervaly would not be ordered if the yaxis is inverted; get_ybound() is
always ordered.  Fix that, add a test, and also test the full-zero input
case recently fixed.

Fix very-edge case in csd(), plus small additional cleanups.

Rework headers for individual backend docs.

Rework plot types quiver

Previously, `csd([0, 0], [0, 0])` would fail with a ZeroDivisionError
when computing yticks.  Fix that by copying the logic from psd, and
streamlining it in both places.  Also fix an unformatted exception
message in specgram.

Previously, the first header would be used in the ToC/sidebar, resulting
e.g. in a "matplotlib.backends.backend_gtk3agg" entry even though the
page documents both backend_gtk3agg and backend_gtk3cairo.  Instead,
merge the titles, and also get rid of the common "matplotlib.backends"
prefix (the individual API doc entries keep the fully qualified name
anyways).

Also fix the qt docs: the canonical version is now at qtagg/qtcairo, not
qt5agg/qt5cairo.

MNT: Deprecate error_msg_foo helpers.

DOC: add missing 'are'

While quiver can be used on individual points, the most common use case
is gridded data. We should use the common use case as the example.
Another reason is that, `quiver()` is assigned to the arrays category
in plot types.

* Update fonts.rst

* Update fonts.rst

Place 3D contourf patches between levels

Fixed typos using codespell. (previous pull request was told not to change the agg files)

Deprecate mlab.stride_windows.

Small doc fixes.

Discourage making style changes to extern/.

Update contributing guide.

cbook->_api; pylab->pyplot.