fix some typos

Former-commit-id: 338c7421e2cd49f558cf09d194fe42c4db701be1

_examples/hello-world/main.go

@@ -26,7 +26,7 @@ func main() {
 
 	// same as app.Handle("GET", "/ping", [...])
 	// Method:   GET
-	// Resource: http://context:8080/ping
+	// Resource: http://localhost:8080/ping
 	app.Get("/ping", func(ctx context.Context) {
 		ctx.WriteString("pong")
 	})

_examples/mvc/hello-world/main.go

@@ -67,7 +67,7 @@ type PingController struct {
 
 // Get serves
 // Method:   GET
-// Resource: http://context:8080/ping
+// Resource: http://localhost:8080/ping
 func (c *PingController) Get() {
 	c.Ctx.WriteString("pong")
 }

_examples/overview/main.go

@@ -24,7 +24,7 @@ func main() {
 	// Reload the templates on each request (development mode).
 	app.RegisterView(view.HTML("./views", ".html").Reload(true))
 
-	// Regster custom handler for specific http errors.
+	// Register custom handler for specific http errors.
 	app.OnErrorCode(iris.StatusInternalServerError, func(ctx context.Context) {
 		// .Values are used to communicate between handlers, middleware.
 		errMessage := ctx.Values().GetString("error")

doc.go

@@ -71,7 +71,7 @@ Example code:
         // Reload the templates on each request (development mode).
         app.RegisterView(iris.HTML("./views", ".html").Reload(true))
 
-        // Regster custom handler for specific http errors.
+        // Register custom handler for specific http errors.
         app.OnErrorCode(iris.StatusInternalServerError, func(ctx context.Context) {
             // .Values are used to communicate between handlers, middleware.
             errMessage := ctx.Values().GetString("error")
@@ -748,7 +748,7 @@ Example Code
 
     // Get serves
     // Method:   GET
-    // Resource: http://context:8080/ping
+    // Resource: http://localhost:8080/ping
     func (c *PingController) Get() {
         c.Ctx.WriteString("pong")
     }