Fix typo

Change-Id: Ib504a5243edd5df96a0f4ff8f7f846e83d384a7b
Reviewed-on: https://gerrit.libreoffice.org/73130
Tested-by: Jenkins
Reviewed-by: Julien Nabet <serval2412@yahoo.fr>

filter/source/graphicfilter/idxf/dxftblrd.hxx

@@ -153,7 +153,7 @@ public:
     ~DXFTables();
 
     void Read(DXFGroupReader & rDGR);
-        // Reads the table until a ENDSEC or EOF
+        // Reads the table until an ENDSEC or EOF
         // (Unknown things/tables will be skipped)
 
     void Clear();