* Add note about ulimit in bash_profile

* developer-guide.md: Document retaining ulimit changes

Signed-off-by: Arve Knudsen <arve.knudsen@gmail.com>

* Fix language

Signed-off-by: Arve Knudsen <arve.knudsen@gmail.com>

* developer-guide.md: Describe troubleshooting ulimit issues

Signed-off-by: Arve Knudsen <arve.knudsen@gmail.com>

Co-authored-by: Arve Knudsen <arve.knudsen@gmail.com>