Improve docs

Author: macladson

book/src/api-vc-endpoints.md

@@ -832,6 +832,13 @@ For more inormation about how to interpret the beacon node health, see [Fallback
 | Required Headers  | [`Authorization`](./api-vc-auth-header.md) |
 | Typical Responses | 200, 400                                   |
 
+Command:
+```bash
+DATADIR=/var/lib/lighthouse
+curl -X GET http://localhost:5062/lighthouse/beacon/health \
+ -H "Authorization: Bearer $(cat ${DATADIR}/validators/api-token.txt)" | jq
+ ```
+
 ### Example Response Body
 
 ```json

book/src/redundancy.md

@@ -77,7 +77,7 @@ can be disabled using the `--broadcast none` flag for `lighthouse vc`.
 
 Since v6.0.0, the validator client will be more aggressive in switching to a fallback node. To do this,
 it uses the concept of "Health". Every slot, the validator client checks each connected beacon node
-to  determine which node is the "Healthiest". In general, the validator client will prefer nodes
+to determine which node is the "Healthiest". In general, the validator client will prefer nodes
 which are synced, have synced execution layers and which are not currently optimisitically
 syncing.