Fix PR comments

By @tnull and @JssDWt

Author: t-bast

02-peer-protocol.md

@@ -1191,7 +1191,7 @@ The sending node:
   - If it wants the receiving node to contribute to the funding transaction
     using `option_will_fund`:
     - MUST send `request_funding` containing one of the `lease_type`s
-      advertised by the receiving node in their [liquidity ads](07-routing-gossip.md#liquidity-ads).
+      supported by the receiving node.
     - MUST set `requested_sats` to the amount of sats it wants to pay for at
       the advertised lease rate.
 
@@ -1283,19 +1283,20 @@ The accepting node:
   - MAY respond with a `funding_satoshis` value of zero.
   - If it requires the opening node to only use confirmed inputs:
     - MUST set `require_confirmed_inputs`
-  - If the `request_funding` tlv was sent in `open_channel2`:
+  - If the `request_funding` TLV was sent in `open_channel2`:
     - If it does not want to contribute funds or to be paid for its
       funding contributions:
-      - SHOULD omit the `provide_funding` tlv.
+      - SHOULD omit the `provide_funding` TLV.
     - Otherwise, if it decides to be paid for its contributions:
-      - MUST include the `provide_funding` tlv.
+      - MUST include the `provide_funding` TLV.
       - MUST set `funding_satoshis` to a value greater than `0`.
       - MAY set `funding_satoshis` less or more than `requested_sats`.
-      - MUST fill the `provide_funding` tlv with a lease witness that
+      - MUST fill the `provide_funding` TLV with a lease witness that
         matches the lease from `request_funds` ([liquidity ads](07-routing-gossip.md#liquidity-ads)).
 
 The receiving node:
   - MAY fail the negotiation if:
+    - It sent `request_funding` and `provide_funding` is not set.
     - It sent `request_funding` and `provide_funding` is set and:
       - `funding_satoshis` is smaller than requested.
   - MUST fail the negotiation if: