treewide: Fix typos

Signed-off-by: Guido Günther <agx@sigxcpu.org>

doc/feedback-themes.rst

@@ -51,7 +51,7 @@ The `Led` feedback type uses two properties to specify the way a LED blinks.
   `green`, `blue` and `white` as well as values in the RGB HEX  format (`#RRGGBB`) where
   `RR`, `GG` and `BB` are two digit  hex value between `00` and `FF` specifying the value of
   each component. E.g. `#00FFFF` corresponds to cyan color.
-- `frequency`: The LEDs blinkinig frequencey in mHz.
+- `frequency`: The LEDs blinkinig frequency in mHz.
 
 See also
 ========

doc/initialization.md

@@ -8,7 +8,7 @@ call [func@Lfb.init]() with the id of your application (usually
 the desktop file name without the .desktop extension). For that you
 include the `libfeedback.h` header. Since the API is considered
 unstable at this point in time you need to acknowledge this by
-definining `LIBFEEDBACK_USE_UNSTABLE_API`:
+defining `LIBFEEDBACK_USE_UNSTABLE_API`:
 
 ```c
   #define LIBFEEDBACK_USE_UNSTABLE_API