Add documentation for multi-dot paths

[kit494way]

Multi-dots (e.g. ...) is recognized as ancestor directory as follows

❯ pwd
/tmp/one/two/three

❯ do { cd ..; pwd }
/tmp/one/two

❯ do { cd ...; pwd }
/tmp/one

❯ do { cd ....; pwd }
/tmp

But this is only mentioned briefly in a release note and in spread operator section of the documentation.

I think it would be helpful to create a dedicated section on the page of moving around, and make links to the section from pages of cd and mv etc.

[fdncred]

Sounds good. Thanks for the suggestion.