moved Visual Studio 6 options into relevant sections

VisualStudio.gitignore

@@ -11,6 +11,10 @@
 #
 # specific to MonoDevelop and Xamarin Studio
 *.userprefs
+#
+# workspace options file
+# remove: if no longer targeting Visual Studio 6
+*.opt
 
 # build output folders generated by Visual Studio
 [Dd]ebug/
@@ -23,6 +27,10 @@ build/
 bld/
 [Bb]in/
 [Oo]bj/
+#
+# default build log file
+# remove: if no longer targeting Visual Studio 6
+*.plg
 
 # MSTest
 # a test framework from Microsoft
@@ -262,9 +270,3 @@ FakesAssemblies/
 
 # Node.js Tools for Visual Studio
 .ntvs_analysis.dat
-
-# Visual Studio 6 build log
-*.plg
-
-# Visual Studio 6 workspace options file
-*.opt