[gdk-pixbuf] docs: Style fixes for the README

[Emmanuele Bassi <ebassi src gnome org>]

commit 0bf68323b255d758f05d84d3f77a7451233091f5
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Thu Aug 30 21:29:36 2018 +0100

    docs: Style fixes for the README
    
    A couple clarifications of the wording in the build instruction.

 README.md | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)
---
diff --git a/README.md b/README.md
index cacacb4a1..e95e9fc60 100644
--- a/README.md
+++ b/README.md
@@ -55,10 +55,11 @@ following commands to build and install GdkPixbuf in the default prefix:
 $ meson _build .
 $ cd _build
 $ ninja
-# ninja install
+$ sudo ninja install
 ```
 
-You can use the `--prefix` argument to control the installation prefix.
+You can use Meson's `--prefix` argument to control the installation prefix
+at configuration time.
 
 You can also use `meson configure` from within the build directory to
 check the current build configuration, and change its options.
@@ -67,13 +68,12 @@ check the current build configuration, and change its options.
 
 You can specify the following options in the command line to `meson`:
 
-* `-Djasper=true` - Enable support for JPEG2000.  This requires
-  libjasper's development files to be installed.
-
-* `-Ddocs=true` - Build the API reference documentation.  This
-  requires `gtk-doc` to be installed.
-
-* `-Drelocatable=true` - Enable application bundle relocation support.
+ * `-Djasper=true` - Enable support for JPEG2000.  This requires
+   [libjasper's development files](http://www.ece.uvic.ca/~frodo/jasper/)
+   to be installed.
+ * `-Ddocs=true` - Build the API reference documentation.  This
+   requires `gtk-doc` to be installed.
+ * `-Drelocatable=true` - Enable application bundle relocation support.
 
 For a complete list of build-time options, see the file
 [`meson_options.txt`](meson_options.txt).  You can read about Meson