DOC: Remove an orphan bracket.

Remove an orphan bracket in the `Git Source Code Repository` section and
add a reference to the git official website.

Author: Jon Haitz Legarreta

SoftwareGuide/Latex/DevelopmentGuidelines/SoftwareProcess.tex

@@ -18,10 +18,10 @@ \section{Git Source Code Repository}
 \index{ITK!Git repository}
 \index{Git}
 
-Git) is a tool for version control. It is a valuable resource for
-software projects involving multiple developers.  The primary purpose
-of Git is to keep track of changes to software. Git date and version
-stamps every addition to files in the repository. Additionally, a user
+Git\footnote\url{https://git-scm.com/} is a tool for version control. It is a
+valuable resource for software projects involving multiple developers. The
+primary purpose of Git is to keep track of changes to software. Git date and
+version stamps every addition to files in the repository. Additionally, a user
 may set a tag to mark a particular of the whole software. Thus, it is
 possible to return to a particular state or point of time whenever
 desired. The differences between any two points is represented by a