docs: fix simple typo, signalls -> signals
There is a small typo in src/util/dispatch.c.
Should read `signals` rather than `signalls`.
@@ -165,7 +165,7 @@ void dispatch_file_deinit(DispatchFile *file) {
*
* Once you handled an event fully, you must clear it via dispatch_file_clear()
* to tell the dispatcher that you should only be invoked for the event
- * when the kernel signalls it again.
+ * when the kernel signals it again.
*/
void dispatch_file_select(DispatchFile *file, uint32_t mask) {
c_assert(!(mask & ~file->kernel_mask));
