doc: fix typo: %s must be % (followup to 158d2212)

Changelog-None

doc/lightning-close.7

@@ -35,7 +35,7 @@ negotiation is performed assuming the peer proposes a fee that is
 different than our estimate\. On every negotiation step we must give up
 some amount from our proposal towards the peer's proposal\. This parameter
 can be an integer in which case it is interpreted as number of satoshis
-to step at a time\. Or it can be an integer followed by "%s" to designate
+to step at a time\. Or it can be an integer followed by "%" to designate
 a percentage of the interval to give up\. A few examples, assuming the peer
 proposes a closing fee of 3000 satoshi and our estimate shows it must be 4000:
 

doc/lightning-close.7.md

@@ -33,7 +33,7 @@ negotiation is performed assuming the peer proposes a fee that is
 different than our estimate. On every negotiation step we must give up
 some amount from our proposal towards the peer's proposal. This parameter
 can be an integer in which case it is interpreted as number of satoshis
-to step at a time. Or it can be an integer followed by "%s" to designate
+to step at a time. Or it can be an integer followed by "%" to designate
 a percentage of the interval to give up. A few examples, assuming the peer
 proposes a closing fee of 3000 satoshi and our estimate shows it must be 4000:
 * "10": our next proposal will be 4000-10=3990.