The previous code sample throws an attribute error around `P.leg2poly()`.
Since commit d41fc4d (2012), leg2poly is not exposed in
np.polynomial, and need to be explicitly called from `legendre`.

Fixes #20925

From my regular expression foo, those are the only 9 case whereas there
are about ~2000 usage that do not have spaces.

While this is ok with docutils/sphinx, it does not seem to be
documented, and that means that other parsers will see that as comments,
leading to for example improper syntax highlighting.

This make it also a tiny bit harder to develop alternative rst parsers.

The math expression needs to be indented, Otherwise it is seen as being
outside the directive and not rendered.

ENH: Vectorizing umath module using AVX-512 (open sourced from Intel Short Vector Math Library, SVML)

Ok, I know legmul is important, I'm not sure I need it twice.

Joking aside, I belive that's a wrong copy-past, as other functions have
`legmulx, legmul`, but as this is the docs of legmulx, I guess the
author removed the `x` without realising legmul was already present.

DOC: fix docstring formatting of polynomial fit method return values.