Fix documentation mis-spelling.

I promise to stop misspelling things when the English language gains a program
that does strict semantic checking.

llvm-svn: 283759
diff --git a/libcxx/CMakeLists.txt b/libcxx/CMakeLists.txt
index 27cddec..6b36471 100644
--- a/libcxx/CMakeLists.txt
+++ b/libcxx/CMakeLists.txt
@@ -272,7 +272,7 @@
 # LIBCXX_LINK_FLAGS: Linker only flags.
 # LIBCXX_LIBRARIES: libraries libc++ is linked to.
 # LIBCXX_INTERFACE_LIBRARIES: Libraries that must be linked when using libc++
-#                             There libraries are exposed in the linker script.
+#                             These libraries are exposed in the linker script.
 set(LIBCXX_COMPILE_FLAGS "")
 set(LIBCXX_LINK_FLAGS "")
 set(LIBCXX_LIBRARIES "")