rs6000: Fix -mreadonly-in-sdata documentation

For some reason I made both an @item and an @itemx for
-mreadonly-in-sdata.  This fixes it.


	* doc/invoke.texi (RS/6000 and PowerPC Options): Delete @itemx for
	-mreadonly-in-sdata.

From-SVN: r260237

gcc/ChangeLog

+2018-05-14  Segher Boessenkool  <segher@kernel.crashing.org>
+
+	* doc/invoke.texi (RS/6000 and PowerPC Options): Delete @itemx for
+	-mreadonly-in-sdata.
+
 2018-05-14  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>
 
 	* config/aarch64/aarch64-simd.md (*aarch64_crypto_aese_fused):

gcc/doc/invoke.texi

@@ -24059,7 +24059,6 @@ in the @code{.data} section, and all uninitialized data in the
 @code{.bss} section.
 
 @item -mreadonly-in-sdata
-@itemx -mreadonly-in-sdata
 @opindex mreadonly-in-sdata
 @opindex mno-readonly-in-sdata
 Put read-only objects in the @code{.sdata} section as well.  This is the