[Etherpad] Fix comment being included in environment variable

pica-etherpad/Dockerfile

@@ -104,5 +104,6 @@ USER etherpad
 EXPOSE 8080
 HEALTHCHECK --interval=20s --timeout=3s CMD curl --fail http://localhost:8080 || exit 1
 WORKDIR /opt/etherpad-lite/
-ENV ABIWORD "/usr/bin/abiword" #installed here by debian
+# Installed here by debian
+ENV ABIWORD "/usr/bin/abiword"
 ENTRYPOINT ["/opt/etherpad-lite/entrypoint.sh", "/opt/etherpad-lite/bin/run.sh" ]