docs: Add doc for verifybackup rpc command.

doc/Makefile

@@ -110,6 +110,7 @@ MANPAGES := doc/lightning-cli.1 \
 	doc/lightning-txsend.7 \
 	doc/lightning-unreserveinputs.7 \
 	doc/lightning-utxopsbt.7 \
+	doc/lightning-verifybackup.7 \
 	doc/lightning-wait.7 \
 	doc/lightning-waitinvoice.7 \
 	doc/lightning-waitanyinvoice.7 \

doc/lightning-verifybackup.7.md

@@ -0,0 +1,46 @@
+lightning-verifybackup -- Command for verifying the status of backup in emergency.recover and peer_storage
+=========================================================================================================================
+
+SYNOPSIS
+--------
+
+**verifybackup**
+
+DESCRIPTION
+-----------
+
+The **verifybackup** RPC command fetches data from the emergency.recover
+file and tries to decrypt it. It also watches out for the latest peer_storage
+that we have in our datastore.
+
+This would help users to detect if there is any discrepancy in the backup that
+is stored in the file or peer_storage. They can use this as a precautionary check,
+if anything goes wrong users and delete the emergency.recover so that node 
+can build a new one upon restart.
+
+RETURN VALUE
+------------
+
+On success, an object is returned, containing:
+- **emergency.recover**:
+  - True, if everything is fine, otherwise the reason filled in as a string.
+- **peer_storage**:
+  - True, if the backup is fine, otherwise the reason filled in as a string.
+
+
+AUTHOR
+------
+
+Aditya <<[email protected]>> is mainly responsible.
+
+SEE ALSO
+--------
+
+lightning-getsharedsecret(7)
+
+RESOURCES
+---------
+
+Main web site: <https://github.com/ElementsProject/lightning>
+
+[comment]: # ( SHA256STAMP:9cfaa9eb4609b36accc3e3b12a352c00ddd402307e4461f4df274146d12f6eb0)