Docs changes

Author: arturcic

docs/input/docs/reference/configuration.md

@@ -519,12 +519,6 @@ Specifies the format of `AssemblyInformationalVersion`.
 Follows the same formatting semantics as `assembly-file-versioning-format`.
 The default value is `{InformationalVersion}`.
 
-### custom-version-format
-
-Specifies the format of `CustomVersion`.
-Follows the same formatting semantics as `assembly-file-versioning-format`.
-The default value is `{SemVer}`.
-
 ### mode
 
 Sets the `mode` of how GitVersion should create a new version. Read more at