Fix spelling, found by lintian

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>

src/helpers.c

 /* Prints a notice about a value which was below `x` and was adjusted to it */
 uint64_t light_log_clamp_min(uint64_t min)
 {
-    LIGHT_NOTE("too small value, adjusting to mininum %lu (raw)", min);
+    LIGHT_NOTE("too small value, adjusting to minimum %lu (raw)", min);
     return min;
 }
 
 /* Prints a notice about a value which was above `x` and was adjusted to it */
 uint64_t light_log_clamp_max(uint64_t max)
 {
-    LIGHT_NOTE("too large value, adjusting to mavalimum %lu (raw)", max);
+    LIGHT_NOTE("too large value, adjusting to maximum %lu (raw)", max);
     return max;
 }