gnrc_sixlowpan_frag_rb: fix doc on DO_NOT_OVERRIDE

sys/include/net/gnrc/sixlowpan/config.h

@@ -83,16 +83,16 @@ extern "C" {
 #endif
 
 /**
- * @brief   Keep all but oldest fragment when reassembly buffer is full
+ * @brief   Do not override oldest datagram when reassembly buffer is full
  *
  * @note    Only applicable with
  *          [gnrc_sixlowpan_frag_rb](@ref net_gnrc_sixlowpan_frag_rb) module
  *
- * When not set, it will cause the reassembly buffer to override the oldest entry
- * if a new entry has to be created and the reassembly buffer is full, no matter what.
- * When set to 1, only incomplete entries that are older than
- * @ref CONFIG_GNRC_SIXLOWPAN_FRAG_RBUF_TIMEOUT_US will be overwritten (they will still
- * timeout normally).
+ * When not set, it will cause the reassembly buffer to override the oldest
+ * entry when a fragment for a new datagram is received. When set, only the
+ * oldest entry that is older than @ref
+ * CONFIG_GNRC_SIXLOWPAN_FRAG_RBUF_TIMEOUT_US will be overwritten (they will
+ * still timeout normally if reassembly buffer is not full).
  */
 #ifdef DOXYGEN
 #define CONFIG_GNRC_SIXLOWPAN_FRAG_RBUF_DO_NOT_OVERRIDE

sys/net/gnrc/network_layer/sixlowpan/frag/rb/Kconfig

@@ -21,13 +21,13 @@ config GNRC_SIXLOWPAN_FRAG_RBUF_TIMEOUT_US
     default 3000000
 
 config GNRC_SIXLOWPAN_FRAG_RBUF_DO_NOT_OVERRIDE
-    bool "Keep all but oldest fragment when reassembly buffer is full"
+    bool "Do not override oldest datagram when reassembly buffer is full"
     help
-        When not set, it will cause the reassembly buffer to
-        override the oldest entry no matter what. When set, only the oldest
-        entry that is older than @ref CONFIG_GNRC_SIXLOWPAN_FRAG_RBUF_TIMEOUT_US
-        will be overwritten (they will still timeout normally if reassembly
-        buffer is not full).
+        When not set, it will cause the reassembly buffer to override the oldest
+        entry when a fragment for a new datagram is received. When set, only the
+        oldest entry that is older than @ref
+        CONFIG_GNRC_SIXLOWPAN_FRAG_RBUF_TIMEOUT_US will be overwritten (they
+        will still timeout normally if reassembly buffer is not full).
 
 config GNRC_SIXLOWPAN_FRAG_RBUF_DEL_TIMER
     int "Deletion timer for reassembly buffer entries in microseconds"