chore: fix some typos in comment (#2735)

Signed-off-by: zhuhaicity <zhuhai@52it.net>

bind.go

@@ -269,7 +269,7 @@ func (b *DefaultBinder) bindData(destination interface{}, data map[string][]stri
 			continue
 		}
 
-		// we could be dealing with pointer to slice `*[]string` so dereference it. There are wierd OpenAPI generators
+		// we could be dealing with pointer to slice `*[]string` so dereference it. There are weird OpenAPI generators
 		// that could create struct fields like that.
 		if structFieldKind == reflect.Pointer {
 			structFieldKind = structField.Elem().Kind()

ip.go

@@ -24,7 +24,7 @@ To retrieve IP address reliably/securely, you must let your application be aware
 In Echo, this can be done by configuring `Echo#IPExtractor` appropriately.
 This guides show you why and how.
 
-> Note: if you dont' set `Echo#IPExtractor` explicitly, Echo fallback to legacy behavior, which is not a good choice.
+> Note: if you don't set `Echo#IPExtractor` explicitly, Echo fallback to legacy behavior, which is not a good choice.
 
 Let's start from two questions to know the right direction:
 

middleware/rate_limiter.go

@@ -191,7 +191,7 @@ NewRateLimiterMemoryStoreWithConfig returns an instance of RateLimiterMemoryStor
 with the provided configuration. Rate must be provided. Burst will be set to the rounded down value of
 the configured rate if not provided or set to 0.
 
-The build-in memory store is usually capable for modest loads. For higher loads other
+The built-in memory store is usually capable for modest loads. For higher loads other
 store implementations should be considered.
 
 Characteristics:

router_test.go

@@ -2773,7 +2773,7 @@ func TestRouter_Routes(t *testing.T) {
 func TestRouter_addEmptyPathToSlashReverse(t *testing.T) {
 	e := New()
 	r := e.router
-	r.add(http.MethodGet, "", "empty", handlerFunc) // emtpy path is normalized to `/`
+	r.add(http.MethodGet, "", "empty", handlerFunc) // empty path is normalized to `/`
 
 	assert.Equal(t, "/", r.Reverse("empty"))
 }