patch: add missing custom header ids

Author: wackerow

public/content/developers/docs/data-and-analytics/index.md

@@ -34,7 +34,7 @@ With The Graph, developers can benefit from:
 
 Follow this [quick-start](https://thegraph.com/docs/en/quick-start/) guide to create, deploy, and query a subgraph within 5 minutes.
 
-## Client diversity
+## Client diversity {#client-diversity}
 
 [Client diversity](/developers/docs/nodes-and-clients/client-diversity/) is important for the overall health of the Ethereum network because it provides resilience to bugs and exploits. There are now several client diversity dashboards including [clientdiversity.org](https://clientdiversity.org/), [rated.network](https://www.rated.network), [supermajority.info](https://supermajority.info//) and [Ethernodes](https://ethernodes.org/).
 
@@ -58,7 +58,7 @@ To start, visit the [Ethereum quick start guide](https://academy.subquery.networ
 
 [Blocknative](https://www.blocknative.com/) provides open access to its Ethereum historical [mempool data archive](https://www.ethernow.xyz/mempool-data-archive). This enables researchers and community good projects to explore the pre-chain layer of Ethereum Mainnet. The data set is actively maintained and represents the most comprehensive historical record of mempool transaction events within the Ethereum ecosystem. Learn more at [Ethernow](https://www.ethernow.xyz/).
 
-## EVM Query Language
+## EVM Query Language {#evm-query-language}
 
 EVM Query Language (EQL) is an SQL-like language designed to query EVM (Ethereum Virtual Machine) chains. EQL's ultimate goal is to support complex relational queries on EVM chain first-class citizens (blocks, accounts, and transactions) while providing developers and researchers with an ergonomic syntax for everyday use. With EQL, developers can fetch blockchain data using familiar SQL-like syntax and eliminate the need for complex boilerplate code. EQL supports standard blockchain data requests (e.g., retrieving an account's nonce and balance on Ethereum or fetching the current block size and timestamp) and is continually adding support for more complex requests and featuresets.