Update TOC.md

Updated title for Help Installation topic, in the TOC

Author: sabotta

docs/release-notes/TOC.md

@@ -5,4 +5,4 @@
 # [SQL Server 2012 SP1 Release Notes](sql-server-2012-sp1-release-notes.md)
 # [SQL Server 2012 SP2 Release Notes](sql-server-2012-sp2-release-notes.md)
 # [Microsoft SQL Server](microsoft-sql-server.md)
-# [SQL Server Help Installation](sql-server-help-installation.md)
+# [Help Viewer for SQL Server](sql-server-help-installation.md)