Small error in docs

[glee92]

https://github.com/xtensor-stack/xtensor/blob/78aaac39143caa78da7c5c0734ccef957535f0c0/docs/source/quickref/manipulation.rst

Very minor issue.

Change

auto sq0 = xt::xqueeze(b); auto sq1 = squeeze(b, {2, 3}, check_policy::full()); auto sq2 = squeeze(b, 2);

to

auto sq0 = xt::squeeze(b); auto sq1 = xt::squeeze(b, {2, 3}, check_policy::full()); auto sq2 = xt::squeeze(b, 2);

[tdegeus]

Thanks a lot. It would be amazing if you can submit a pull request, I'll be happy to merge it!