Fortran: Document scope operator.

Document scope operator in GDB manual.

2016-08-10  Bernhard Heckel  <bernhard.heckel@intel.com>

gdb/Changelog:
	* doc/gdb.texinfo: Describe scope operator.

Change-Id: I15ff901b4a729f0994410a971bba639ebc361d2a
diff --git a/gdb/doc/gdb.texinfo b/gdb/doc/gdb.texinfo
old mode 100644
new mode 100755
index 8e29eca..230ead0
--- a/gdb/doc/gdb.texinfo
+++ b/gdb/doc/gdb.texinfo
@@ -15228,6 +15228,9 @@
 types.  Also suitable for unions.  As unions aren't part of regular Fortran,
 this can only happen when accessing a register that uses a gdbarch-defined
 union type.
+@item ::
+The scope operator. Normally used to access variables in modules or to set breakpoints
+on subroutines nested in modules or in other subroutines (internal subroutines).
 @end table
 
 @node Fortran Defaults