doc: the description of readable.push() method

ImHype · ImHype · commit b6803ef7befe · 2019-09-25T14:02:21.000+08:00
diff --git a/doc/api/stream.md b/doc/api/stream.md
@@ -2150,8 +2150,8 @@ class SourceWrapper extends Readable {
 }
 ```
 
-The `readable.push()` method is intended be called only by `Readable`
-implementers, and only from within the `readable._read()` method.
+The `readable.push()` method is used to push the content
+into the internal buffer. It can be driven by the `readable._read()` method.
 
 For streams not operating in object mode, if the `chunk` parameter of
 `readable.push()` is `undefined`, it will be treated as empty string or

Original file line number	Diff line number	Diff line change
`@@ -2150,8 +2150,8 @@ class SourceWrapper extends Readable {`
`2150`	`2150`	`}`
`2151`	`2151`	```
`2152`	`2152`
`2153`		-The `readable.push()` method is intended be called only by `Readable`
`2154`		-implementers, and only from within the `readable._read()` method.
	`2153`	+The `readable.push()` method is used to push the content
	`2154`	+into the internal buffer. It can be driven by the `readable._read()` method.
`2155`	`2155`
`2156`	`2156`	For streams not operating in object mode, if the `chunk` parameter of
`2157`	`2157`	`readable.push()` is `undefined`, it will be treated as empty string or