Fix typos/style in doxygen documentation
diff --git a/include/mbedtls/net.h b/include/mbedtls/net.h
index 9f757fe..586bd34 100644
--- a/include/mbedtls/net.h
+++ b/include/mbedtls/net.h
@@ -149,7 +149,7 @@
* \param buf The buffer to write to
* \param len Maximum length of the buffer
*
- * \return This function returns the number of bytes received,
+ * \return the number of bytes received,
* or a non-zero error code; with a non-blocking socket,
* MBEDTLS_ERR_SSL_WANT_READ indicates read() would block.
*/
@@ -163,7 +163,7 @@
* \param buf The buffer to read from
* \param len The length of the buffer
*
- * \return This function returns the number of bytes sent,
+ * \return the number of bytes sent,
* or a non-zero error code; with a non-blocking socket,
* MBEDTLS_ERR_SSL_WANT_WRITE indicates write() would block.
*/
@@ -179,7 +179,7 @@
* \param len Maximum length of the buffer
* \param timeout Maximum number of milliseconds to wait for data
*
- * \return This function returns the number of bytes received,
+ * \return the number of bytes received,
* or a non-zero error code:
* MBEDTLS_ERR_SSL_TIMEOUT if the operation timed out,
* MBEDTLS_ERR_SSL_WANT_READ if interrupted by a signal.