fix: document files/ignores behavior

Author: HerringtonDarkholme

website/guide/project/lint-rule.md

@@ -154,6 +154,8 @@ Be sure to remove `./` to the beginning of your rules. ast-grep will not recogni
 
 :::
 
+Paths in both `files` and `ignores` are relative to the project root directory, that is, `sgconfig.yml`'s directory.
+
 ## Customize Code Highlighting
 
 ast-grep will report linting issues with highlighted code span called label. A label describes an underlined region of code associated with an issue. _By default, the matched target code and its surrounding code captured by [relational rules](/guide/rule-config/relational-rule.html)_.

website/reference/yaml.md

@@ -253,6 +253,8 @@ files:
 Be sure to remove `./` to the beginning of your rules. ast-grep will not recognize the paths if you add `./`.
 :::
 
+Paths in `files` are relative to the project root directory, that is, `sgconfig.yml`'s directory.
+
 
 ### `ignores`
 * type: `Array<String>`
@@ -279,6 +281,7 @@ To disable this behavior, use [`--no-ignore`](/reference/cli.html#scan) in CLI.
 `ignores` is a rule-wise configuration that only filters files that are not ignored by the CLI.
 :::
 
+Paths in `ignores` are relative to the project root directory, that is, `sgconfig.yml`'s directory.
 
 ## Other