doc: replace dashes

core/include/msg.h

@@ -81,7 +81,7 @@
  * mode or the message queue (see below) of the receiving thread is full
  * messages sent this way will be dropped.
  *
- * You can use the example on asynchronous IPC below — but without the queue —
+ * You can use the example on asynchronous IPC below - but without the queue -
  * to get an impression of how to use non-blocking IPC.
  *
  * Synchronous vs Asynchronous

doc/doxygen/src/mainpage.md

@@ -208,7 +208,7 @@ starting point for anyone who is new to RIOT.
 For more information best browse that directory and have a look at the
 `README.md` files that ship with each example.
 
-To create your own application — here or anywhere else — see @ref creating-an-application
+To create your own application - here or anywhere else - see @ref creating-an-application
 
 tests
 -----

drivers/kw2xrf/kw2xrf_getset.c

@@ -351,8 +351,8 @@ uint32_t kw2xrf_get_rssi(uint32_t value)
     /* Get rssi (Received Signal Strength Indicator, unit is dBm)
      * from lqi (Link Quality Indicator) value.
      * There are two different equations for RSSI:
-     * RF = (LQI – 286.6) / 2.69333 (MKW2xD Reference Manual)
-     * RF = (LQI – 295.4) / 2.84 (MCR20A Reference Manual)
+     * RF = (LQI - 286.6) / 2.69333 (MKW2xD Reference Manual)
+     * RF = (LQI - 295.4) / 2.84 (MCR20A Reference Manual)
      * The last appears more to match the graphic (Figure 3-10).
      * Since RSSI value is always positive and we want to
      * avoid the floating point computation:

sys/hashes/doc.txt

@@ -26,7 +26,7 @@
  * * Kernighan and Ritchie
  * * Shift, And, Xor
  * * Donald E. Knuth
- * * Fowler–Noll–Vo hash function
+ * * Fowler-Noll-Vo hash function
  * * Rotating Hash
  * * One at a time Hash
  *