doc: normalize 3DNow! spelling and spacing.

[Ralf Wildenhues <Ralf dot Wildenhues at gmx dot de>]

The documentation currently contains all of the
  3Dnow!
  3Dnow
  3dNOW!
  3DNow!

forms, ignoring option strings.  Wikipedia uses '3DNow!'.  AMD uses
'3D-Now!' (once) and '3DNow' (many times) (both TM-ed) on their website.
OK to change the string to '3DNow!' throughout?

Tested 'make info html pdf'.  OK for trunk?

Thanks,
Ralf

doc: normalize 3DNow! spelling and spacing.

gcc/ChangeLog:
2010-02-28  Ralf Wildenhues  <Ralf.Wildenhues@gmx.de>

	* doc/extend.texi (Vector Extensions, X86 Built-in Functions):
	Use '3DNow!' for the extension of that name, ensure normal space
	after the string.
	* doc/invoke.texi (i386 and x86-64 Options): Likewise.

diff --git a/gcc/doc/extend.texi b/gcc/doc/extend.texi
index ae5f748..f6b7158 100644
--- a/gcc/doc/extend.texi
+++ b/gcc/doc/extend.texi
@@ -6058,7 +6058,7 @@ purposes.
 
 On some targets, the instruction set contains SIMD vector instructions that
 operate on multiple values contained in one large register at the same time.
-For example, on the i386 the MMX, 3Dnow! and SSE extensions can be used
+For example, on the i386 the MMX, 3DNow!@: and SSE extensions can be used
 this way.
 
 The first step in using these extensions is to provide the necessary data
@@ -8203,7 +8203,7 @@ The following machine modes are available for use with MMX built-in functions
 vector of eight 8-bit integers.  Some of the built-in functions operate on
 MMX registers as a whole 64-bit entity, these use @code{V1DI} as their mode.
 
-If 3Dnow extensions are enabled, @code{V2SF} is used as a mode for a vector
+If 3DNow!@: extensions are enabled, @code{V2SF} is used as a mode for a vector
 of two 32-bit floating point values.
 
 If SSE extensions are enabled, @code{V4SF} is used for a vector of four 32-bit
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
index 354602e..6a6babc 100644
--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi
@@ -11715,36 +11715,36 @@ instruction set support.
 @item k6
 AMD K6 CPU with MMX instruction set support.
 @item k6-2, k6-3
-Improved versions of AMD K6 CPU with MMX and 3dNOW!@: instruction set support.
+Improved versions of AMD K6 CPU with MMX and 3DNow!@: instruction set support.
 @item athlon, athlon-tbird
-AMD Athlon CPU with MMX, 3dNOW!, enhanced 3dNOW!@: and SSE prefetch instructions
+AMD Athlon CPU with MMX, 3dNOW!, enhanced 3DNow!@: and SSE prefetch instructions
 support.
 @item athlon-4, athlon-xp, athlon-mp
-Improved AMD Athlon CPU with MMX, 3dNOW!, enhanced 3dNOW!@: and full SSE
+Improved AMD Athlon CPU with MMX, 3DNow!, enhanced 3DNow!@: and full SSE
 instruction set support.
 @item k8, opteron, athlon64, athlon-fx
 AMD K8 core based CPUs with x86-64 instruction set support.  (This supersets
-MMX, SSE, SSE2, 3dNOW!, enhanced 3dNOW!@: and 64-bit instruction set extensions.)
+MMX, SSE, SSE2, 3DNow!, enhanced 3DNow!@: and 64-bit instruction set extensions.)
 @item k8-sse3, opteron-sse3, athlon64-sse3
 Improved versions of k8, opteron and athlon64 with SSE3 instruction set support.
 @item amdfam10, barcelona
 AMD Family 10h core based CPUs with x86-64 instruction set support.  (This
-supersets MMX, SSE, SSE2, SSE3, SSE4A, 3dNOW!, enhanced 3dNOW!, ABM and 64-bit
+supersets MMX, SSE, SSE2, SSE3, SSE4A, 3DNow!, enhanced 3DNow!, ABM and 64-bit
 instruction set extensions.)
 @item winchip-c6
 IDT Winchip C6 CPU, dealt in same way as i486 with additional MMX instruction
 set support.
 @item winchip2
-IDT Winchip2 CPU, dealt in same way as i486 with additional MMX and 3dNOW!@:
+IDT Winchip2 CPU, dealt in same way as i486 with additional MMX and 3DNow!@:
 instruction set support.
 @item c3
-Via C3 CPU with MMX and 3dNOW!@: instruction set support.  (No scheduling is
+Via C3 CPU with MMX and 3DNow!@: instruction set support.  (No scheduling is
 implemented for this chip.)
 @item c3-2
 Via C3-2 CPU with MMX and SSE instruction set support.  (No scheduling is
 implemented for this chip.)
 @item geode
-Embedded AMD CPU with MMX and 3dNOW! instruction set support.
+Embedded AMD CPU with MMX and 3DNow!@: instruction set support.
 @end table
 
 While picking a specific @var{cpu-type} will schedule things appropriately