doc: use consistent naming in stream doc

Consistency of method naming

referred to as readable.push several other times in transform
documentation and also documented under readable, so makes sense
to just stick with readable.push

PR-URL: #30506
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

doc/api/stream.md

@@ -2804,7 +2804,7 @@ method. This will be called when there is no more written data to be consumed,
 but before the [`'end'`][] event is emitted signaling the end of the
 [`Readable`][] stream.
 
-Within the `transform._flush()` implementation, the `readable.push()` method
+Within the `transform._flush()` implementation, the `transform.push()` method
 may be called zero or more times, as appropriate. The `callback` function must
 be called when the flush operation is complete.
 
@@ -2833,7 +2833,7 @@ methods only.
 All `Transform` stream implementations must provide a `_transform()`
 method to accept input and produce output. The `transform._transform()`
 implementation handles the bytes being written, computes an output, then passes
-that output off to the readable portion using the `readable.push()` method.
+that output off to the readable portion using the `transform.push()` method.
 
 The `transform.push()` method may be called zero or more times to generate
 output from a single input chunk, depending on how much is to be output
@@ -2845,7 +2845,7 @@ The `callback` function must be called only when the current chunk is completely
 consumed. The first argument passed to the `callback` must be an `Error` object
 if an error occurred while processing the input or `null` otherwise. If a second
 argument is passed to the `callback`, it will be forwarded on to the
-`readable.push()` method. In other words, the following are equivalent:
+`transform.push()` method. In other words, the following are equivalent:
 
 ```js
 transform.prototype._transform = function(data, encoding, callback) {