Various improvements

- Move switch spec from Aether to SD-Fabric. Update the list
- Move ONIE/ONL deployment/troubleshooting section from Aether to SD-Fabric

Change-Id: I3eaeb839f8e1fc595a775c305246c7659bb82cdb
diff --git a/dict.txt b/dict.txt
index 3e7bd66..21a62e8 100644
--- a/dict.txt
+++ b/dict.txt
@@ -13,6 +13,7 @@
 DDoS
 Edgecore
 Fluentbit
+GbE
 GPP
 Gerrit
 Grafana
@@ -63,6 +64,7 @@
 bitrate
 blackhole
 blackholing
+bootloader
 bursty
 centric
 chipset
@@ -95,6 +97,7 @@
 linecard
 linecards
 loopback
+mainboard
 microburst
 microservice
 misconfiguration