Fix texinfo problem by adding the required period after an @xref.

* ld.texinfo (Options): Add missing period after @xref.

ld/ChangeLog

@@ -1,3 +1,7 @@
+2015-07-14  Nick Clifton  <nickc@redhat.com>
+
+	* ld.texinfo (Options): Add missing period after @xref.
+
 2015-07-10  Alan Modra  <amodra@gmail.com>
 
 	* ldexp.c (align_dot_val): New function.

ld/ld.texinfo

@@ -2096,7 +2096,7 @@ which refers to it.
 @item --warn-orphan
 The @option{--warn-orphan} option tells the linker to generate a
 warning message whenever it has to place an orphan section into the
-output file.  @xref{Orphan Sections}  The @option{--no-warn-orphan}
+output file.  @xref{Orphan Sections}.  The @option{--no-warn-orphan}
 option restores the default behaviour of just silently placing these
 sections.