Further updated casing of overrideconfig argument in help text.

Author: labmonkey42

src/GitVersionExe/HelpWriter.cs

@@ -25,7 +25,7 @@ path            The directory containing .git. If not defined current directory
                     eg /output json /showvariable SemVer - will output `1.2.3+beta.4`
     /l              Path to logfile.
     /showconfig     Outputs the effective GitVersion config (defaults + custom from GitVersion.yaml) in yaml format
-    /overrideconfig Overrides GitVersion config values inline (semicolon-separated key value pairs e.g. /overrideConfig:tag-prefix=Foo)
+    /overrideconfig Overrides GitVersion config values inline (semicolon-separated key value pairs e.g. /overrideconfig:tag-prefix=Foo)
 
     # AssemblyInfo updating
     /updateassemblyinfo