[PATCH v1] RTEMS Docs: Add steps for sphinxcontrib-bibtex

[Vaibhav Gupta]

Add step to install sphinxcontrib-bibtex
together with the steps mentioned for ArcLinux,
to install sphinx and dependencies.

Signed-off-by: Vaibhav Gupta <vaibhavgupta40 at gmail.com>
---
 README.txt | 1 +
 1 file changed, 1 insertion(+)

diff --git a/README.txt b/README.txt
index 9fd2165..ce30505 100644
--- a/README.txt
+++ b/README.txt
@@ -286,6 +286,7 @@ Arch Linux
 Sphinx:
 
   # pacman -S python-sphinx
+  # pacman -S python-sphinxcontrib-bibtex
 
 PDF:
 
-- 
2.26.0