Documentation: clarify sentence

Author: deining

packages/mermaid/src/docs/config/configuration.md

@@ -4,8 +4,8 @@ When mermaid starts, configuration is extracted to determine a configuration to
 
 - The default configuration
 - Overrides at the site level are set by the initialize call, and will be applied to all diagrams in the site/app. The term for this is the **siteConfig**.
-- Frontmatter (v10.5.0+) - diagram authors can update select configuration parameters in the frontmatter of the diagram. These are applied to the render config.
-- Directives (Deprecated by Frontmatter) - diagram authors can update select configuration parameters directly in the diagram code via directives. These are applied to the render config.
+- Frontmatter (v10.5.0+) - diagram authors can update selected configuration parameters in the frontmatter of the diagram. These are applied to the render config.
+- Directives (Deprecated by Frontmatter) - diagram authors can update selected configuration parameters directly in the diagram code via directives. These are applied to the render config.
 
 **The render config** is configuration that is used when rendering by applying these configurations.