docs: Update computed.md to better highlight what not to do (#1758)

Author: Jothinayagan

src/guide/essentials/computed.md

@@ -263,7 +263,7 @@ Now when you run `fullName.value = 'John Doe'`, the setter will be invoked and `
 
 ### Getters should be side-effect free
 
-It is important to remember that computed getter functions should only perform pure computation and be free of side effects. For example, don't make async requests or mutate the DOM inside a computed getter! Think of a computed property as declaratively describing how to derive a value based on other values - its only responsibility should be computing and returning that value. Later in the guide we will discuss how we can perform side effects in reaction to state changes with [watchers](./watchers).
+It is important to remember that computed getter functions should only perform pure computation and be free of side effects. For example, **don't make async requests or mutate the DOM inside a computed getter!** Think of a computed property as declaratively describing how to derive a value based on other values - its only responsibility should be computing and returning that value. Later in the guide we will discuss how we can perform side effects in reaction to state changes with [watchers](./watchers).
 
 ### Avoid mutating computed value