[gnome-session] meson: Fix comment grammar in meson_post_install.py

[Ray Strode <halfline src gnome org>]

commit 1e0a03af3c02af1884e6619801838a9d0ac34149
Author: Neal Gompa <ngompa fedoraproject org>
Date:   Fri Oct 29 09:41:42 2021 -0400

    meson: Fix comment grammar in meson_post_install.py
    
    The sentence is grammatically incorrect and is confusing to read.

 meson_post_install.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/meson_post_install.py b/meson_post_install.py
index e2e352cc..27017f65 100644
--- a/meson_post_install.py
+++ b/meson_post_install.py
@@ -15,7 +15,7 @@ if not os.environ.get('DESTDIR'):
   print('Compile gsettings schemas...')
   subprocess.call(['glib-compile-schemas', schemadir])
 
-# FIXME: this is due to unable to copy a generated target file:
+# FIXME: Meson is unable to copy a generated target file:
 #        https://groups.google.com/forum/#!topic/mesonbuild/3iIoYPrN4P0
 dst_dir = os.path.join(install_root, 'wayland-sessions')
 if not os.path.exists(dst_dir):