feat: Support project-level ls_specific_settings (#1192)

docs/02-usage/050_configuration.md

@@ -213,8 +213,10 @@ This ensures backward compatibility: existing projects that already have a `.ser
 Most users will not need to adjust these settings.
 :::
 
-Under the key `ls_specific_settings` in `serena_config.yml`, you can you pass per-language, 
-language server-specific configuration.
+Under the key `ls_specific_settings` in `serena_config.yml`, you can you pass global per-language, 
+language server-specific configuration. You can use the same key in the project configuration files (`project.yml`
+and `project.local.yml` ) to override or extend the global settings for a specific project.
+The settings are merged on top-level, meaning that project-level settings for a language will replace global settings for the same language.
 
 Structure:
 
@@ -230,6 +232,7 @@ Most settings are currently undocumented. Please refer to the
 implementation to determine supported settings.
 :::
 
+(override-ls-path)=
 #### Overriding the Language Server Path
 
 Some language servers, particularly those that use a single core path for the language server (e.g. the main executable),