DOC: Fix capitalisation in doc/source/whatsnew - part1 (issue #32550)
- [ ] modify files index.rst, v0.4.x.rst, v0.5.0.rst, v0.6.0.rst

- [ ] passes `black pandas`
- [ ] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
Should version numbers begin with a capital 'v' or not? > I think version numbers are ok in lowercase, but if that fails the script and complicates things too much, I guess in upper case would also be ok.

Ok so changing it to uppercase > Ok so changing it to uppercase

Just realized that we'll be capitalizing the first one of `V0.4.1 through v0.4.3`, which I think it's not great. May be we can use `Versions v0.4.1 through v0.4.3` or something similar instead? > > Ok so changing it to uppercase
> 
> Just realized that we'll be capitalizing the first one of `V0.4.1 through v0.4.3`, which I think it's not great. May be we can use `Versions v0.4.1 through v0.4.3` or something similar instead?

Ok changing it to "Versions ..." Looks like in recent versions we use `v0.0.0` instead of `v.0.0.0`. But I think if we add the word version, we can actually get rid of the `v`, and just leave `Version 0.6.0`... What do you think? > Looks like in recent versions we use `v0.0.0` instead of `v.0.0.0`. But I think if we add the word version, we can actually get rid of the `v`, and just leave `Version 0.6.0`... What do you think?

For me it would be ok. But Im not in the project enough to know if it would make sense You're welcome! can merge master and ping on green. @jreback
Updated, merged master.  Thanks @cleconte987  > Thanks @cleconte987

You're welcome!