Use Infinity as highWaterMark value instead of having the sizeAlgorithm returning zero.

This makes it clearer backpressure is disabled.
Mention reducing buffering as the reason behind this choice.

Fixes #188.

Author: youennf

index.bs

@@ -89,8 +89,8 @@ At construction of each {{RTCRtpSender}} or {{RTCRtpReceiver}}, run the followin
 4. <a dfn for="ReadableStream">Set up</a> [=this=].`[[readable]]`. [=this=].`[[readable]]` is provided frames using the [$readEncodedData$] algorithm given |this| as parameter.
 5. Set [=this=].`[[readable]]`.`[[owner]]` to |this|.
 6. Initialize [=this=].`[[writable]]` to a new {{WritableStream}}.
-7. <a dfn for="WritableStream">Set up</a> [=this=].`[[writable]]` with its [=WritableStream/set up/writeAlgorithm=] set to [$writeEncodedData$] given |this| as parameter and its [=WritableStream/set up/sizeAlgorithm=] to an algorithm that returns <code>0</code>.
-    <p class="note">Chunk size is set to 0 to explictly disable streams backpressure on the write side.</p>
+7. <a dfn for="WritableStream">Set up</a> [=this=].`[[writable]]` with its [=WritableStream/set up/writeAlgorithm=] set to [$writeEncodedData$] given |this| as parameter and its [=WritableStream/set up/highWaterMark=] set to <code>Infinity</code>.
+    <p class="note">highWaterMark is set to Infinity to explicitly disable backpressure. The goal is to limit buffering as much as possible.</p>
 8. Set [=this=].`[[writable]]`.`[[owner]]` to |this|.
 9. Initialize [=this=].`[[pipeToController]]` to null.
 1. Initialize [=this=].`[[lastReceivedFrameCounter]]` to <code>0</code>.