[rtems-docs commit] Update README due to use of math extension

[Sebastian Huber]

Module:    rtems-docs
Branch:    master
Commit:    0680bd2d05847f423f0bb04e5b39abc33e57f80c
Changeset: http://git.rtems.org/rtems-docs/commit/?id=0680bd2d05847f423f0bb04e5b39abc33e57f80c

Author:    Sebastian Huber <sebastian.huber at embedded-brains.de>
Date:      Thu Feb  2 09:14:50 2017 +0100

Update README due to use of math extension

---

 README.txt | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/README.txt b/README.txt
index aeb6ca5..3238886 100644
--- a/README.txt
+++ b/README.txt
@@ -37,8 +37,9 @@ The hosts which produce production quality is:
 Host Setup
 ----------
 
-HTML builds directly with Sphinx, PDF requires a full Latex (texlive) install,
-and building a Single HTML page requires the 'inliner' tool. The
+For HTML output a Sphinx and a full Latex (texlive) installation is necessary.
+Sphinx uses Latex to produce images of mathematical formulas for the HTML
+output.  Building a Single HTML page requires the 'inliner' tool. The
 sphinxcontrib-bibtex extension is mandatory.
 
 Please add your host as you set it up.