[json-glib/json-glib-1-4] Update the description for the 'docs' build option

[Emmanuele Bassi <ebassi src gnome org>]

commit b55347f1fc50069f5fcfe61da085c5c4b32de089
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Tue Sep 18 09:58:29 2018 +0100

    Update the description for the 'docs' build option
    
    The `docs` option only controls the build of the API reference; for the
    man pages, there's the `man` option.

 meson_options.txt | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/meson_options.txt b/meson_options.txt
index 237b725..75152aa 100644
--- a/meson_options.txt
+++ b/meson_options.txt
@@ -3,7 +3,7 @@ option('introspection',
        description: 'Build the introspection data (requires gobject-introspection)')
 option('docs',
        type: 'boolean', value: false,
-       description: 'Build the API reference and man pages (requires gtk-doc and xsltproc)')
+       description: 'Build the API reference (requires gtk-doc)')
 option('man',
        type: 'boolean', value: false,
        description: 'Build the man pages (requires xsltproc)')