Update docs/guides/http_crawlers.mdx

Co-authored-by: Vlada Dusek <[email protected]>

Author: Mantisus

docs/guides/http_crawlers.mdx

@@ -143,7 +143,7 @@ This approach is recommended when you need tight integration between parsing and
 
 The following example demonstrates how to create a custom crawler using `selectolax` with the `Lexbor` engine.
 
-### Implementing the parser
+### Parser implementation
 
 The parser converts HTTP responses into a parsed document and provides methods for element selection. Implement <ApiLink to="class/AbstractHttpParser">`AbstractHttpParser`</ApiLink> using `selectolax` with required methods for parsing and querying: