Docs for array creation routines: section "ones and zeros" should be renamed

The “ones and zeros” sections contains also entries for full and full_like, which logically belong to that section but are not for “ones and zeros” 😃 I don’t have a good suggestion, though.

[melissawm]

There doesn’t seem to be a name for these. However, Arrays filled with a single value doesn’t go with empty, empty_like or identity to me. Since the next section is “From existing data”, I’d suggest something like “From shape or value” but that may be too vague.

[rossbar]

@anntzer is right, the problem is in the heading in array creation routines in the reference guide. Relevant source file: doc/source/reference/routines.array-creation.rst