Merge pull request sudheerj#20 from omerg/broken-anchor-links

Some links in table of contents are broken. (233, 249, 267, 306 )

Author: sudheerj

README.md

@@ -246,7 +246,7 @@
 |230| [What are the benefits of React Router V4?](#what-are-the-benefits-of-react-router-v4)|
 |231| [Can you describe about componentDidCatch lifecycle method signature?](#can-you-describe-about-componentdidcatch-lifecycle-method-signature)|
 |232| [In which scenarios error boundaries do not catch errors?](#in-which-scenarios-error-boundaries-do-not-catch-errors)|
-|233| [Why do not you need error boundaries for event handlers?](#why-do-not-you-need-error-boundaries-for-event0-handlers)|
+|233| [Why do not you need error boundaries for event handlers?](#why-do-not-you-need-error-boundaries-for-event-handlers)|
 |234| [What is the difference between try cath block and error boundaries?](#what-is-the-difference-between-try-catch-block-and-error-boundaries)|
 |235| [What is the behavior of uncaught errors in react 16?](#what-is-the-behavior-of-uncaught-errors-in-react-16)|
 |236| [What is the proper placement for error boundaries?](#what-is-the-proper-placement-for-error-boundaries)|
@@ -262,7 +262,7 @@
 |246| [What are the methods invoked during error handling?](#what-are-the-methods-invoked-during-error-handling)|
 |247| [What is the purpose of displayName class property?](#what-is-the-purpose-of-displayname-class-property)|
 |248| [What is the browser support for react applications?](#what-is-the-browser-support-for-react-applications)|
-|249| [What is the purpose of unmountComponentAtNode method?](#what-is-the-purpose-of-unmountcomponentatNode-method)|
+|249| [What is the purpose of unmountComponentAtNode method?](#what-is-the-purpose-of-unmountcomponentatnode-method)|
 |250| [What is code-splitting?](#what-is-code-splitting)|
 |251| [What is the benefit of strict mode?](#what-is-the-benefit-of-strict-mode)|
 |252| [What are Keyed Fragments?](#what-are-keyed-fragments)|
@@ -280,7 +280,7 @@
 |264| [How do you say that state updates are merged?](#how-do-you-say-that-state-updates-are-merged)|
 |265| [How do you pass arguments to an event handler?](#how-do-you-pass-arguments-to-an-event-handler)|
 |266| [How to prevent component from rendering?](#how-to-prevent-component-from-rendering)|
-|267| [What are the conditions to safely use the index as a key?](#What-are-the-conditions-to-safely-use-the-index-as-a-key)|
+|267| [What are the conditions to safely use the index as a key?](#what-are-the-conditions-to-safely-use-the-index-as-a-key)|
 |268| [Is it keys should be globally unique?](#is-it-keys-should-be-globally-unique)|
 |269| [What is the popular choice for form handling?](#what-is-the-popular-choice-for-form-handling)|
 |270| [What are the advantages of formik over redux form library?](#what-are-the-advantages-of-formik-over-redux-form-library)|
@@ -319,7 +319,7 @@
 |303| [How to fetch data with React Hooks?](#how-to-fetch-data-with-react-hooks)|
 |304| [Is Hooks cover all use cases for classes?](#is-hooks-cover-all-use-cases-for-classes)|
 |305| [What is the stable release for hooks support?](#what-is-the-stable-release-for-hooks-support)|
-|306| [Why do we use square brackets in useState?](#why-do-we-use-square-brackets-in-usestate?)|
+|306| [Why do we use square brackets in useState?](#why-do-we-use-square-brackets-in-usestate)|
 |307| [What are the sources used for introducing hooks?](#what-are-the-sources-used-for-introducing-hooks)|
 |308| [How do you access imperative API of web components?](#how-do-you-access-imperative-api-of-web-components)|
 |309| [What is formik?](#what-is-formik)|