doc: fix incorrect references in buffer docs

PR-URL: #6194
Reviewed-By: Colin Ihrig <[email protected]>
Reviewed-By: Brian White <[email protected]>
Reviewed-By: Michaël Zasso <[email protected]>

Author: Amery2010

doc/api/buffer.markdown

@@ -799,8 +799,8 @@ buf.readUInt8(1);
 * Return: {Number}
 
 Reads an unsigned 16-bit integer from the Buffer at the specified `offset` with
-specified endian format (`readInt32BE()` returns big endian,
-`readInt32LE()` returns little endian).
+specified endian format (`readUInt16BE()` returns big endian,
+`readUInt16LE()` returns little endian).
 
 Setting `noAssert` to `true` skips validation of the `offset`. This allows the
 `offset` to be beyond the end of the Buffer.
@@ -832,8 +832,8 @@ buf.readUInt16LE(2);
 * Return: {Number}
 
 Reads an unsigned 32-bit integer from the Buffer at the specified `offset` with
-specified endian format (`readInt32BE()` returns big endian,
-`readInt32LE()` returns little endian).
+specified endian format (`readUInt32BE()` returns big endian,
+`readUInt32LE()` returns little endian).
 
 Setting `noAssert` to `true` skips validation of the `offset`. This allows the
 `offset` to be beyond the end of the Buffer.