Review 26984

C. Thomas Tyler
Refinements to mkdirs.sh and mkdirs.cfg, per code review:
https://swarm.workshop.perforce.com/reviews/26962

In mkdirs.cfg:
* Added comments about proper use of DB1/DB2.
* Added comment about coming removal of P4FTP/P4WEB settings.

In mkdirs.sh v4.1.1:
* Replaced -M with set of -M* flags to specify mount points.
* Completed implementation of -M* flags.
* Enhanced examples in usage function.
* Added clarification of difference between '-n' and '-p'.
* Fixed some typos.

#review @rcowham
Tip: Use n and p to cycle through the changes.