[aarch64] PR90016 - aarch64: reference to undeclared N in help for command line option

'to N' is now redundant and misleading given the earlier change to use
<number>.

Removed.

	PR target/90016
	* config/aarch64/aarch64.opt (msve-vector-bits): Remove redundant and
	obsolete reference to N.

From-SVN: r270248

gcc/ChangeLog

+2019-04-10  Richard Earnshaw  <rearnsha@arm.com>
+
+	PR target/90016
+	* config/aarch64/aarch64.opt (msve-vector-bits): Remove redundant and
+	obsolete reference to N.
+
 2019-04-10  Jakub Jelinek  <jakub@redhat.com>
 
 	PR middle-end/90025

gcc/config/aarch64/aarch64.opt

@@ -216,7 +216,7 @@ Enum(sve_vector_bits) String(2048) Value(SVE_2048)
 
 msve-vector-bits=
 Target RejectNegative Joined Enum(sve_vector_bits) Var(aarch64_sve_vector_bits) Init(SVE_SCALABLE)
--msve-vector-bits=<number>	Set the number of bits in an SVE vector register to N.
+-msve-vector-bits=<number>	Set the number of bits in an SVE vector register
 
 mverbose-cost-dump
 Target Undocumented Var(flag_aarch64_verbose_cost)