Remove formula with confusing variables

draft-ietf-quic-transport.md

@@ -2255,11 +2255,7 @@ Endpoints SHOULD abandon path validation based on a timer. When setting this
 timer, implementations are cautioned that the new path could have a longer
 round-trip time than the original.  A value of three times the larger of the
 current Probe Timeout (PTO) or the PTO for the new path (that is, using
-kInitialRtt as defined in {{QUIC-RECOVERY}}) is RECOMMENDED.  That is:
-
-~~~
-   validation_timeout = 3*max(PTO_current, PTO_new)
-~~~
+kInitialRtt as defined in {{QUIC-RECOVERY}}) is RECOMMENDED.
 
 This timeout allows for multiple PTOs to expire prior to failing path
 validation, so that loss of a single PATH_CHALLENGE or PATH_RESPONSE frame