Cleanup

- Use doc8 to check rst files
- Add spellcheck and VOLTHA-specific dictionary, fix spelling
- Other formatting and content fixes

Change-Id: I1eea3ab6eba4ec34af0788a681f1e8cd258ea988
diff --git a/dict.txt b/dict.txt
new file mode 100644
index 0000000..faa2c0a
--- /dev/null
+++ b/dict.txt
@@ -0,0 +1,98 @@
+Apps
+Autocomplete
+Broadcom
+Docsis
+Edgecore
+GOPATH
+Golang
+Graphviz
+IDE
+Indices
+Inline
+Kubernetes
+Ponsim
+Preprovision
+Protobuf
+Protos
+Pypi
+Quickstart
+README
+Sadis
+Ubuntu
+Username
+Voltha
+Wireshark
+aaa
+ack
+aggregator
+amd
+app
+apps
+auth
+autocomplete
+backhaul
+bbsim
+bbsimctl
+config
+dep
+dhcp
+dhcpl
+dockerhub
+eap
+eapol
+etcd
+filesystem
+gRPC
+gerrit
+github
+golang
+gz
+https
+internet
+io
+kafka
+kubernetes
+lifecycle
+localhost
+lossofomcichannel
+lossofploam
+macports
+md
+microservices
+ofagent
+olt
+online
+onos
+onu
+opencord
+openolt
+openonu
+oper
+org
+patchset
+poweron
+ppa
+preprovision
+protobuf
+protobufs
+protoc
+protos
+quickstart
+reStructuredText
+repo
+repos
+rst
+rw
+sadis
+signaldegrade
+src
+toolset
+vendored
+virtualenv
+virtualized
+voltctl
+voltha
+wiki
+wireshark
+xDSL
+zookeeper