chore: fix typos (#103)

packages/runtime-core/src/helpers/renderSlot.ts

@@ -13,7 +13,7 @@ export function renderSlot(
   name: string,
   props: any = {},
   // this is not a user-facing function, so the fallback is always generated by
-  // the compiler and gurunteed to be an array
+  // the compiler and guaranteed to be an array
   fallback?: VNodeChildren
 ): VNode {
   const slot = slots[name]

packages/runtime-core/src/helpers/toString.ts

@@ -1,6 +1,6 @@
 import { isArray, isPlainObject, objectToString } from '@vue/shared'
 
-// for conversting {{ interpolation }} values to displayed strings.
+// for converting {{ interpolation }} values to displayed strings.
 export function toString(val: any): string {
   return val == null
     ? ''