net: includes: Fix indentation in header files

The indentation went wrong when the integer types was changed
from the type "u8_t" to type "uint8_t". This changed the length
of the type and caused the code to look bad in places.

Signed-off-by: Jukka Rissanen <jukka.rissanen@linux.intel.com>
diff --git a/include/net/net_if.h b/include/net/net_if.h
index 8bf1caa..6f6b05e 100644
--- a/include/net/net_if.h
+++ b/include/net/net_if.h
@@ -716,8 +716,8 @@
  * @brief Set a network interface's link address
  *
  * @param iface Pointer to a network interface structure
- * @param addr A pointer to a uint8_t buffer representing the address. The buffer
- *             must remain valid throughout interface lifetime.
+ * @param addr A pointer to a uint8_t buffer representing the address.
+ *             The buffer must remain valid throughout interface lifetime.
  * @param len length of the address buffer
  * @param type network bearer type of this link address
  *