[libadwaita/wip/exalm/build-docs: 3/4] docs: Fix the flatpak manifest example

[Alexander Mikhaylenko <alexm src gnome org>]

commit ce5f4b5181c9e3e43dcd425a50728ee851a8dc84
Author: Alexander Mikhaylenko <alexm gnome org>
Date:   Tue May 18 12:26:34 2021 +0500

    docs: Fix the flatpak manifest example
    
    Don't include build-dir: true and specify the branch as flatpak-builder
    won't pick up main automatically.

 doc/build-howto.md | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/doc/build-howto.md b/doc/build-howto.md
index 58b56250..d35bf381 100644
--- a/doc/build-howto.md
+++ b/doc/build-howto.md
@@ -55,7 +55,6 @@ your manifest:
 {
   "name" : "libadwaita",
   "buildsystem" : "meson",
-  "builddir" : true,
   "config-opts": [
     "-Dexamples=false",
     "-Dtests=false"
@@ -63,7 +62,8 @@ your manifest:
   "sources" : [
     {
       "type" : "git",
-      "url" : "https://gitlab.gnome.org/GNOME/libadwaita.git";
+      "url" : "https://gitlab.gnome.org/GNOME/libadwaita.git";,
+      "branch" : "main"
     }
   ]
 }