Note AIX 4.3 assembler bug for RS/6000 installation.

From-SVN: r18080

gcc/install.texi

@@ -1403,12 +1403,14 @@ stage3 object files, and errors when compiling @file{libgcc.a} or
 xlc-1.3.0.0 (distributed with AIX 3.2.5), and xlc-1.3.0.19.  Both
 xlc-1.2.1.28 and xlc-1.3.0.24 (PTF 432238) are known to produce working
 versions of GNU CC, but most other recent releases correctly bootstrap
-GNU CC.  Also, releases of AIX prior to AIX 3.2.4 include a version of
+GNU CC.
+
+Release 4.3.0 of AIX and ones prior to AIX 3.2.4 include a version of
 the IBM assembler which does not accept debugging directives: assembler
 updates are available as PTFs.  Also, if you are using AIX 3.2.5 or
 greater and the GNU assembler, you must have a version modified after
 October 16th, 1995 in order for the GNU C compiler to build.  See the
-file @file{README.RS6000} for more details on of these problems.
+file @file{README.RS6000} for more details on any of these problems.
 
 GNU CC does not yet support the 64-bit PowerPC instructions.