fix minor typos in todomvc example;

examples/todomvc/src/todomvc/db.cljs

@@ -52,7 +52,7 @@
 ;;
 ;; Part of the todomvc challenge is to store todos in LocalStorage, and
 ;; on app startup, reload the todos from when the program was last run.
-;; But the challenge stipulates to NOT  load the setting for the "showing"
+;; But the challenge stipulates to NOT load the setting for the "showing"
 ;; filter. Just the todos.
 ;;
 
@@ -69,7 +69,7 @@
 ;; Use `reg-cofx` to register a "coeffect handler" which will inject the todos
 ;; stored in localstore.
 ;;
-;; To see it used, look in `events.clj` at the event handler for `:initialise-db`.
+;; To see it used, look in `events.cljs` at the event handler for `:initialise-db`.
 ;; That event handler has the interceptor `(inject-cofx :local-store-todos)`
 ;; The function registered below will be used to fulfill that request.
 ;;

examples/todomvc/src/todomvc/events.cljs

@@ -35,7 +35,7 @@
 ;; When included in the interceptor chain of an event handler, this interceptor
 ;; runs `check-and-throw` `after` the event handler has finished, checking
 ;; the value for `app-db` against a spec.
-;; If the event handler corrupted tha value for `app-db` an exception will be
+;; If the event handler corrupted the value for `app-db` an exception will be
 ;; thrown. This helps us detect event handler bugs early.
 ;; Because all state is held in `app-db`, we are effectively validating the
 ;; ENTIRE state of the application after each event handler runs.  All of it.

examples/todomvc/src/todomvc/subs.cljs

@@ -6,7 +6,7 @@
 ;;
 ;; See https://github.com/Day8/re-frame/blob/master/docs/SubscriptionInfographic.md
 ;;
-;; Layer 2 query functions, are "extractors". They take from `app-db`
+;; Layer 2 query functions are "extractors". They take from `app-db`
 ;; and don't do any further computation on the extracted values. Any further
 ;; computation should happen in Layer 3.
 ;; Why?  It is an efficiency thing. Every Layer 2 subscriptions will rerun anytime