Remove symbolator requirement.

Signed-off-by: Tim 'mithro' Ansell <tansell@google.com>

docs/requirements.txt

diff --git a/docs/requirements.txt b/docs/requirements.txt
index f20b3a6..43d2ef2 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -10,7 +10,7 @@
 sphinxcontrib-hdl-diagrams
 
 # Module diagrams
-git+https://github.com/SymbiFlow/symbolator.git#egg=symbolator
+#git+https://github.com/SymbiFlow/symbolator.git#egg=symbolator
 
 # pycairo
 # vext.gi