[doc] TLV parser has far grown beyond GSM L3

Let's hence not call the group "GSM L3 compatible TLV parser"

Change-Id: Ic53f9c0d5ee787f994f42cf2aff313c6e131fbe6
diff --git a/include/osmocom/gsm/tlv.h b/include/osmocom/gsm/tlv.h
index f903223..5bf4a87 100644
--- a/include/osmocom/gsm/tlv.h
+++ b/include/osmocom/gsm/tlv.h
@@ -7,7 +7,7 @@
 #include <osmocom/core/bit16gen.h>
 #include <osmocom/core/bit32gen.h>
 
-/*! \defgroup tlv GSM L3 compatible TLV parser
+/*! \defgroup tlv TLV parser
  *  @{
  * \file tlv.h */