Fix MIN_CONNECT_TIMEOUT/INITIAL_BACKOFF in the connection_backoff doc.

This also removes some obsolete discussion of what Stubby does/did; this
was useful for contrasting but isn't particularly interesting now.

doc/connection-backoff.md

@@ -30,7 +30,8 @@ ConnectWithBackoff()
 ```
 
 With specific parameters of
-INITIAL_BACKOFF = 20 seconds
+MIN_CONNECT_TIMEOUT = 20 seconds
+INITIAL_BACKOFF = 1 second
 MULTIPLIER = 1.6
 MAX_BACKOFF = 120 seconds
 JITTER = 0.2
@@ -42,40 +43,3 @@ different jitter logic.
 Alternate implementations must ensure that connection backoffs started at the
 same time disperse, and must not attempt connections substantially more often
 than the above algorithm.
-
-## Historical Algorithm in Stubby
-
-Exponentially increase up to a limit of MAX_BACKOFF the intervals between
-connection attempts. This is what stubby 2 uses, and is equivalent if
-TryConnect() fails instantly.
-
-```
-LegacyConnectWithBackoff()
-  current_backoff = INITIAL_BACKOFF
-  while (TryConnect(MIN_CONNECT_TIMEOUT) != SUCCESS)
-    SleepFor(current_backoff)
-    current_backoff = Min(current_backoff * MULTIPLIER, MAX_BACKOFF)
-```
-
-The grpc C implementation currently uses this approach with an initial backoff
-of 1 second, multiplier of 2, and maximum backoff of 120 seconds. (This will
-change)
-
-Stubby, or at least rpc2, uses exactly this algorithm with an initial backoff
-of 1 second, multiplier of 1.2, and a maximum backoff of 120 seconds.
-
-## Use Cases to Consider
-
-* Client tries to connect to a server which is down for multiple hours, eg for
-  maintenance
-* Client tries to connect to a server which is overloaded
-* User is bringing up both a client and a server at the same time
-    * In particular, we would like to avoid a large unnecessary delay if the
-      client connects to a server which is about to come up
-* Client/server are misconfigured such that connection attempts always fail
-    * We want to make sure these don’t put too much load on the server by
-      default.
-* Server is overloaded and wants to transiently make clients back off
-* Application has out of band reason to believe a server is back
-    * We should consider an out of band mechanism for the client to hint that
-      we should short circuit the backoff.