chore: fix typo in test (#12291)

test/ssr/ssr-basic-renderer.spec.js

@@ -52,7 +52,7 @@ describe('SSR: basicRenderer', () => {
   })
 
   // #5941
-  it('should work peoperly when accessing $ssrContext in root component', done => {
+  it('should work properly when accessing $ssrContext in root component', done => {
     let ssrContext
     renderToString(new Vue({
       template: `

test/unit/features/component/component-scoped-slot.spec.js

@@ -1327,7 +1327,7 @@ describe('Component scoped slot', () => {
   })
 
   // #11652
-  it('should update when swtching between two components with slot and without slot', done => {
+  it('should update when switching between two components with slot and without slot', done => {
     const Child = {
       template: `<div><slot/></div>`
     }

test/unit/features/directives/on.spec.js

@@ -218,7 +218,7 @@ describe('Directive v-on', () => {
   })
 
   // ctrl, shift, alt, meta
-  it('should support system modifers', () => {
+  it('should support system modifiers', () => {
     vm = new Vue({
       el,
       template: `