bootstrap: add doc-comments for Severity

Signed-off-by: onur-ozkan <[email protected]>

Author: onur-ozkan

src/bootstrap/src/lib.rs

@@ -81,7 +81,10 @@ pub struct ConfigChange {
 
 #[derive(Clone, Debug)]
 pub enum Severity {
+    /// Used when upstream bootstrap configurations continue working as before.
     Info,
+    /// Used when upstream bootstrap configurations change, and it may
+    /// require developers to update their build configuration.
     Warning,
 }
 
@@ -96,7 +99,6 @@ impl ToString for Severity {
 
 /// Keeps track of major changes made to the bootstrap configuration.
 ///
-///
 /// If you make any major changes (such as adding new values or changing default values),
 /// please ensure adding `ConfigChange` to the end(because the list must be sorted by the merge date)
 /// of this list.