[gtk-web/gtk4-prep] Mention meson subprojects for unstable builds

[Matthias Clasen <matthiasc src gnome org>]

commit edc0e63a6244afdece51545bfe07986285c49d44
Author: Matthias Clasen <mclasen redhat com>
Date:   Wed Oct 7 19:03:52 2020 -0400

    Mention meson subprojects for unstable builds
    
    I haven't taken out jhbuild entirely yet. Maybe we should.

 _docs/installations/linux.md | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)
---
diff --git a/_docs/installations/linux.md b/_docs/installations/linux.md
index 1b6f9b15..4144adea 100644
--- a/_docs/installations/linux.md
+++ b/_docs/installations/linux.md
@@ -32,9 +32,10 @@ good starting point.
 
 ## Development version
 
-To build the latest development version of GTK it is recommended to use a
-tool like [JHBuild](https://wiki.gnome.org/Projects/Jhbuild), which will
-download, and optionally build, all the required project dependencies.
+To build the latest development version of GTK you can use a tool like
+[JHBuild](https://wiki.gnome.org/Projects/Jhbuild), or you can rely on
+meson which will download and build many of the required dependencies
+as subprojects, if they are not available on your system.
 
 ## Older Versions