rs6000: Fix spelling of AltiVec in rs6000.opt (PR79397)

It was spelled Altivec in two user-facing messages in rs6000.opt; let's
be consistent.


	PR translation/79397
	* config/rs6000/rs6000.opt (maltivec=le, maltivec=be): Fix spelling
	of AltiVec.

From-SVN: r245276

gcc/ChangeLog

+2017-02-08  Segher Boessenkool  <segher@kernel.crashing.org>
+
+	PR translation/79397
+	* config/rs6000/rs6000.opt (maltivec=le, maltivec=be): Fix spelling
+	of AltiVec.
+
 2017-02-08  Martin Jambor  <mjambor@suse.cz>
 
 	PR ipa/79375

gcc/config/rs6000/rs6000.opt

@@ -142,11 +142,11 @@ Use AltiVec instructions.
 
 maltivec=le
 Target Report RejectNegative Var(rs6000_altivec_element_order, 1) Save
-Generate Altivec instructions using little-endian element order.
+Generate AltiVec instructions using little-endian element order.
 
 maltivec=be
 Target Report RejectNegative Var(rs6000_altivec_element_order, 2)
-Generate Altivec instructions using big-endian element order.
+Generate AltiVec instructions using big-endian element order.
 
 mhard-dfp
 Target Report Mask(DFP) Var(rs6000_isa_flags)