Update index.html

fixed typo to maintain consistency

index.html

@@ -33,7 +33,7 @@ <h2>EIP Types</h2>
 
 <p>EIPs are separated into a number of types, and each has its own list of EIPs.</p>
 
-<h3>Standard Track ({{site.pages|where:"type","Standards Track"|size}})</h3>
+<h3>Standards Track ({{site.pages|where:"type","Standards Track"|size}})</h3>
 <p>Describes any change that affects most or all Ethereum implementations, such as a change to the network protocol, a change in block or transaction validity rules, proposed application standards/conventions, or any change or addition that affects the interoperability of applications using Ethereum. Furthermore Standard EIPs can be broken down into the following categories.</p>
 
 <h4><a href="{{"core"|relative_url}}">Core</a> ({{site.pages|where:"type","Standards Track"|where:"category","Core"|size}})</h4>