Fix typo in VersionOptions.cs

Co-Authored-By: ap0llo <[email protected]>

Author: AArnott

src/NerdBank.GitVersioning/VersionOptions.cs

@@ -1142,7 +1142,7 @@ public enum ReleaseVersionIncrement
             Minor,
 
             /// <summary>
-            /// Inrementn the build number (the third number in a version) after creating a release branch
+            /// Increment the build number (the third number in a version) after creating a release branch.
             /// </summary>
             Build,
         }