popd: add '-n' option; pushd: add '-n' option (#10435)

* Add '-n' option to pushd and popd

* Update pushd page

---------

Co-authored-by: K.B.Dharun Krishna <kbdharunkrishna@gmail.com>

pages/common/popd.md

@@ -15,3 +15,7 @@
 - Remove the Nth directory (starting from zero to the right from the list printed with `dirs`):
 
 `popd -N`
+
+- Remove the 1st directory (starting from zero to the left from the list printed with `dirs`):
+
+`popd -n`

pages/common/pushd.md

@@ -2,6 +2,7 @@
 
 > Place a directory on a stack so it can be accessed later.
 > See also `popd` to switch back to original directory and `dirs` to display directory stack contents.
+> More information: <https://www.gnu.org/software/bash/manual/html_node/Directory-Stack-Builtins.html>.
 
 - Switch to directory and push it on the stack:
 
@@ -14,3 +15,7 @@
 - Rotate stack by making the 5th element the top of the stack:
 
 `pushd +4`
+
+- Rotate the stack 4 times to the left (the current directory stays at the top by replacing the 5th element):
+
+`pushd -n +4`