doc: change "it's" to "its" where necessary

doc/api/crypto.md

@@ -1651,7 +1651,7 @@ added: REPLACEME
 -->
 
 Encapsulates an X509 certificate and provides read-only access to
-it's information.
+its information.
 
 ```js
 const { X509Certificate } = require('crypto');

doc/api/http.md

@@ -1927,7 +1927,7 @@ An `IncomingMessage` object is created by [`http.Server`][] or
 and [`'response'`][] event respectively. It may be used to access response
 status, headers and data.
 
-Different from it's `socket` value which is a subclass of {stream.Duplex}, the
+Different from its `socket` value which is a subclass of {stream.Duplex}, the
 `IncomingMessage` itself extends {stream.Readable} and is created separately to
 parse and emit the incoming HTTP headers and payload, as the underlying socket
 may be reused multiple times in case of keep-alive.

doc/api/n-api.md

@@ -2739,7 +2739,7 @@ napi_status napi_get_buffer_info(napi_env env,
 Returns `napi_ok` if the API succeeded.
 
 This API is used to retrieve the underlying data buffer of a `node::Buffer`
-and it's length.
+and its length.
 
 *Warning*: Use caution while using this API since the underlying data buffer's
 lifetime is not guaranteed if it's managed by the VM.