Mac Operating System

[aollier]

#1161 did not replace all occurences of "Mac" refering to the Mac Operating System.

I think that "Mac" in the following lines should be replaced by "macOS":

book/01-introduction/sections/installing.asc:36:(((Mac, installing)))
book/01-introduction/sections/installing.asc:54:You can also install it as part of the GitHub for Mac install.
book/01-introduction/sections/installing.asc:56:You can download that tool from the GitHub for Mac website, at http://mac.github.com[]. (not sure for this one)
book/02-git-basics/sections/getting-a-repository.asc:21:for Mac:
book/04-git-server/sections/git-on-a-server.asc:8:Here we'll be demonstrating the commands and steps needed to do basic, simplified installations on a Linux-based server, though it's also possible to run these services on Mac or Windows servers.
book/08-customizing-git/sections/attributes.asc:20:For instance, Xcode projects on the Mac contain a file that ends in .pbxproj, which is basically a JSON (plain-text JavaScript data format) dataset written out to disk by the IDE, which records your build settings and so on.
book/08-customizing-git/sections/config.asc:248:We'll use path names in the examples that work on Mac and Linux systems; for Windows, you'll have to change /usr/local/bin to an executable path in your environment.
book/08-customizing-git/sections/config.asc:252:We'll use the Mac path for the executable; in other systems, it will be where your p4merge binary is installed.
book/08-customizing-git/sections/config.asc:391:This is because Windows uses both a carriage-return character and a linefeed character for newlines in its files, whereas Mac and Linux systems use only the linefeed character.
book/08-customizing-git/sections/config.asc:403:If you're on a Linux or Mac system that uses LF line endings, then you don't want Git to automatically convert them when you check out files; however, if a file with CRLF endings accidentally gets introduced, then you may want Git to fix it.
book/08-customizing-git/sections/config.asc:411:This setup should leave you with CRLF endings in Windows checkouts, but LF endings on Mac and Linux systems and in the repository.
book/A-git-in-other-environments/sections/guis.asc:69:==== GitHub for Mac and Windows
book/A-git-in-other-environments/sections/guis.asc:71:(((GitHub for Mac)))(((GitHub for Windows)))
book/A-git-in-other-environments/sections/guis.asc:76:.GitHub for Mac.
book/A-git-in-other-environments/sections/guis.asc:77:image::images/github_mac.png[GitHub for Mac.]
book/A-git-in-other-environments/sections/guis.asc:99:GitHub for Windows can be downloaded from https://windows.github.com[], and GitHub for Mac from https://mac.github.com[].

@easybe do you agree with those changes ?