update docs

Author: Oren Novotny

docs/usage/command-line.md

@@ -36,6 +36,8 @@ This can be done for *.cs, *.vb and *.fs files.
 
 When requesting that GitVersion generate an assembly info file you are limited to only specifying a single `<filename>` within the `/updateassemblyinfo` switch, this is to prevent the creation of mulitple assembly info files with the same assembly version attributes.  If this occurs your build will fail.
 
+Optionally, you can have GitVersion skip/ignore an `AssemblyVersion` attribute with the `/excludeUpdateAssemblyVersion` switch. This may be useful in cases where strict control is needed over the `AssemblyVersion` for binding redirects.
+
 ### Example: When AssemblyInfo.cs does not exist
 `GitVersion.exe /updateassemblyinfo AssemblyInfo.cs /ensureassemblyinfo`
 
@@ -46,6 +48,11 @@ A file is generated that contains version attributes (`AssemblyVersion`, `Assemb
 
 All known attributes (`AssemblyVersion`, `AssemblyFileVersion`, `AssemblyInformationalVersion`) will be updated
 
+### Example: When AssemblyInfo.cs already exists
+`GitVersion.exe /updateassemblyinfo AssemblyInfo.cs /ensureassemblyinfo /excludeUpdateAssemblyVersion`
+
+Some attributes (`AssemblyFileVersion`, `AssemblyInformationalVersion`) will be updated, `AssemblyVersion` will be ignored.
+
 ### Example: When AssemblyInfo.cs and AssemblyVersionInfo.cs do not exist
 `GitVersion.exe /updateassemblyinfo AssemblyInfo.cs AssemblyVersionInfo.cs /ensureassemblyinfo`
 

src/GitVersionExe/HelpWriter.cs

@@ -31,11 +31,13 @@ path            The directory containing .git. If not defined current directory
     # AssemblyInfo updating
     /updateassemblyinfo
                     Will recursively search for all 'AssemblyInfo.cs' files in the git repo and update them
+    /excludeUpdateAssemblyVersion
+                    Will exclude adding or updating the AssemblyVersion attribute when updating assembly info files
     /updateassemblyinfofilename
                     Specify name of AssemblyInfo file. Can also /updateAssemblyInfo GlobalAssemblyInfo.cs as a shorthand
     /ensureassemblyinfo
                     If the assembly info file specified with /updateassemblyinfo or /updateassemblyinfofilename is not found, 
-                    it be created with these attributes: AssemblyFileVersion, FileVersion and AssemblyInformationalVersion
+                    it be created with these attributes: AssemblyFileVersion, AssemblyVersion and AssemblyInformationalVersion
                     ---        
                     Supports writing version info for: C#, F#, VB    
     # Remote repository args