README.rst: Fixed formatting

No empty lines after a section title, 2 empty lines before a section title.
diff --git a/README.rst b/README.rst
index bfacffd..f571ebf 100644
--- a/README.rst
+++ b/README.rst
@@ -6,9 +6,9 @@
 .. image:: https://gitlab.com/BuildStream/buildstream/badges/master/coverage.svg?job=coverage
    :target: https://gitlab.com/BuildStream/buildstream/commits/master
 
+
 What is BuildStream?
 ====================
-
 BuildStream is a Free Software tool for building/integrating software stacks.
 It takes inspiration, lessons and use-cases from various projects including
 OBS, Reproducible Builds, Yocto, Baserock, Buildroot, Aboriginal, GNOME Continuous,
@@ -18,9 +18,9 @@
 make, meson, qmake), and can create outputs in a range of formats (e.g. debian packages,
 flatpak runtimes, sysroots, system images) for multiple platforms and chipsets.
 
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 Why should I use BuildStream?
 =============================
-
 BuildStream offers the following advantages:
 
 * **Declarative build instructions/definitions**
@@ -49,16 +49,16 @@
   BuildStream can create full systems and complete toolchains from scratch, for
   a range of ISAs including x86_32, x86_64, ARMv7, ARMv8, MIPS.
 
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 How do I use BuildStream?
 =========================
-
 Please refer to the `documentation <https://buildstream.gitlab.io/buildstream/>`_
 for  information about installing BuildStream, and about the BuildStream YAML format
 and plugin options.
 
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 How does BuildStream work?
 ==========================
-
 BuildStream operates on a set of YAML files (.bst files), as follows:
 
 * loads the YAML files which describe the target(s) and all dependencies
@@ -70,9 +70,9 @@
 * transforms/configures and/or deploys the resulting target(s) based on the
   instructions declared in the .bst files.
 
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 How can I get started?
 ======================
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 The easiest way to get started is to explore some existing .bst files, for example:
 
 * https://gitlab.gnome.org/GNOME/gnome-build-meta/