docs: clarify client documentation

Again, these changes are just to effect a release.

A change to the release workflow also removes testing the environment variable and re-exporting it.
On the last build I ran, it appears to have worked as expected, where previously it didn't. Doesn't
really make any sense.

sn_client/src/api.rs

@@ -64,7 +64,8 @@ impl Client {
 
     /// Instantiate a new client.
     ///
-    /// Optionally specify the maximum time the client will wait for a connection before timing out.
+    /// Optionally specify the duration for the connection timeout.
+    ///
     /// Defaults to 180 seconds.
     ///
     /// # Arguments