doc: fix return value of write methods

Fixes: https:github.com/nodejs/node/issues/5682
PR-URL: nodejs/node#5736
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Sakthipriyan Vairamani <thechargingvolcano@gmail.com>

doc/api/buffer.markdown

@@ -1027,7 +1027,7 @@ console.log(`${len} bytes: ${buf.toString('utf8', 0, len)}`);
 * `value` {Number} Bytes to be written to Buffer
 * `offset` {Number} `0 <= offset <= buf.length - 8`
 * `noAssert` {Boolean} Default: false
-* Return: {Number} Numbers of bytes written
+* Return: {Number} The offset plus the number of written bytes
 
 Writes `value` to the Buffer at the specified `offset` with specified endian
 format (`writeDoubleBE()` writes big endian, `writeDoubleLE()` writes little
@@ -1059,7 +1059,7 @@ console.log(buf);
 * `value` {Number} Bytes to be written to Buffer
 * `offset` {Number} `0 <= offset <= buf.length - 4`
 * `noAssert` {Boolean} Default: false
-* Return: {Number} Numbers of bytes written
+* Return: {Number} The offset plus the number of written bytes
 
 Writes `value` to the Buffer at the specified `offset` with specified endian
 format (`writeFloatBE()` writes big endian, `writeFloatLE()` writes little
@@ -1091,7 +1091,7 @@ console.log(buf);
 * `value` {Number} Bytes to be written to Buffer
 * `offset` {Number} `0 <= offset <= buf.length - 1`
 * `noAssert` {Boolean} Default: false
-* Return: {Number} Numbers of bytes written
+* Return: {Number} The offset plus the number of written bytes
 
 Writes `value` to the Buffer at the specified `offset`. The `value` must be a
 valid signed 8-bit integer.
@@ -1117,7 +1117,7 @@ console.log(buf);
 * `value` {Number} Bytes to be written to Buffer
 * `offset` {Number} `0 <= offset <= buf.length - 2`
 * `noAssert` {Boolean} Default: false
-* Return: {Number} Numbers of bytes written
+* Return: {Number} The offset plus the number of written bytes
 
 Writes `value` to the Buffer at the specified `offset` with specified endian
 format (`writeInt16BE()` writes big endian, `writeInt16LE()` writes little
@@ -1144,7 +1144,7 @@ console.log(buf);
 * `value` {Number} Bytes to be written to Buffer
 * `offset` {Number} `0 <= offset <= buf.length - 4`
 * `noAssert` {Boolean} Default: false
-* Return: {Number} Numbers of bytes written
+* Return: {Number} The offset plus the number of written bytes
 
 Writes `value` to the Buffer at the specified `offset` with specified endian
 format (`writeInt32BE()` writes big endian, `writeInt32LE()` writes little
@@ -1172,7 +1172,7 @@ console.log(buf);
 * `offset` {Number} `0 <= offset <= buf.length - byteLength`
 * `byteLength` {Number} `0 < byteLength <= 6`
 * `noAssert` {Boolean} Default: false
-* Return: {Number} Numbers of bytes written
+* Return: {Number} The offset plus the number of written bytes
 
 Writes `value` to the Buffer at the specified `offset` and `byteLength`.
 Supports up to 48 bits of accuracy. For example:
@@ -1199,7 +1199,7 @@ should not be used unless you are certain of correctness.
 * `value` {Number} Bytes to be written to Buffer
 * `offset` {Number} `0 <= offset <= buf.length - 1`
 * `noAssert` {Boolean} Default: false
-* Return: {Number} Numbers of bytes written
+* Return: {Number} The offset plus the number of written bytes
 
 Writes `value` to the Buffer at the specified `offset`. The `value` must be a
 valid unsigned 8-bit integer.
@@ -1228,7 +1228,7 @@ console.log(buf);
 * `value` {Number} Bytes to be written to Buffer
 * `offset` {Number} `0 <= offset <= buf.length - 2`
 * `noAssert` {Boolean} Default: false
-* Return: {Number} Numbers of bytes written
+* Return: {Number} The offset plus the number of written bytes
 
 Writes `value` to the Buffer at the specified `offset` with specified endian
 format (`writeUInt16BE()` writes big endian, `writeUInt16LE()` writes little
@@ -1262,7 +1262,7 @@ console.log(buf);
 * `value` {Number} Bytes to be written to Buffer
 * `offset` {Number} `0 <= offset <= buf.length - 4`
 * `noAssert` {Boolean} Default: false
-* Return: {Number} Numbers of bytes written
+* Return: {Number} The offset plus the number of written bytes
 
 Writes `value` to the Buffer at the specified `offset` with specified endian
 format (`writeUInt32BE()` writes big endian, `writeUInt32LE()` writes little
@@ -1295,7 +1295,7 @@ console.log(buf);
 * `offset` {Number} `0 <= offset <= buf.length - byteLength`
 * `byteLength` {Number} `0 < byteLength <= 6`
 * `noAssert` {Boolean} Default: false
-* Return: {Number} Numbers of bytes written
+* Return: {Number} The offset plus the number of written bytes
 
 Writes `value` to the Buffer at the specified `offset` and `byteLength`.
 Supports up to 48 bits of accuracy. For example: