Typo. By Dirk Eddelbuettel.

git-svn-id: https://svn.r-project.org/R/trunk@87708 00db46b3-68df-0310-9c12-caf00c1e9a41

doc/manual/R-exts.texi

@@ -5904,7 +5904,7 @@ versions instead.)
 @c RHEL 7 came with GCC 4.8, with 4.4 available.
 @c RHEL 8 has GCC 8 with 9 available
 @c RHEL 9 has GCC 11
-@c All versions of Cwntos is now EOL.
+@c All versions of Centos are now EOL.
 A common error is to assume recent versions of compilers or OSes.  In
 production environments `long term support' versions of OSes may be in
 use for many years,@footnote{Ubuntu provides 5 years of support (but