Apply suggestions from code review

Co-authored-by: Aleksandr Statciuk <7253922+freearhey@users.noreply.github.com>
Co-authored-by: Dum4G <dumreview@gmail.com>

CONTRIBUTING.md

@@ -7,8 +7,8 @@
   - [Reporting of broken streams](#reporting-of-broken-streams)
   - [Finding of broken streams](#finding-of-broken-streams)
   - [Removing infrighting content](#removing-infrighting-content)
-- [Requirements](#requirements)
-- [Validation](#validation)
+- [Link Requirements](#link-requirements)
+- [Stream Validation](#stream-validation)
   - [How do I know if the stream is eligible?](#how-do-i-know-if-the-stream-is-eligible)
   - [Examples](#examples)
   - [Testing](#testing)
@@ -111,7 +111,7 @@ The channel will also be added to our [blocklist](https://github.com/iptv-org/da
 
 Please note that we only accept removal requests from channel owners and their official representatives, all other requests will be closed immediately.
 
-## Requirements
+## Link Requirements
 
 
 Before submitting new streams you should verify the following:
@@ -127,7 +127,7 @@ Before submitting new streams you should verify the following:
 - If the host server requires a specific user-agent and/or a referer, is geo-blocked or may have downtimes, you should represent that in your contribution (see the [Stream Description Scheme](#stream-description-scheme)).
 - If possible please provide an adaptive link that covers every available resolution for a broadcast.
 - Follow the [Playlist Structure](#playlist-structure) in case of contributing by pull requests.
-## Validation
+
 ## Stream Validation
 
 ### How do I know if the stream is eligible?