inconsistent capitalization in Replace Mode docs

[Linnae Cintron]

Have also found some inconsistency with upper and lower case us of Replace Mode terminology.on this page:

http://docs.evergreen-ils.org/reorg/3.2/cataloging/_replace_mode.html

[Heather Lindskold (heatherlindskold)]

Kristy Bauman worked on this at the docs hackfest for #evgils19.
Pull request # 84 submitted 4/24/19.

[Remington Steed (rjs7)]

For easier finding, here's the GitHub branch:

https://github.com/evergreen-library-system/Evergreen/pull/84

[Jane Sandberg (sandbergja)]

Thanks, Linnae, Katie, Kristy, and Remington. Improving consistency in our documentation is always welcome. I've taken your change and added it to the master, rel_3_3, rel_3_2 and rel_3_1 branches (aka the Current development version, 3.3, 3.2, and 3.1 official docs).