Fix various docstring typos.

  * unqiue -> unique
  * overriden -> overridden
  * sentinal -> sentinel

core/codegen/src/syn_ext.rs

@@ -80,7 +80,7 @@ impl IdentExt for syn::Ident {
         self.prepend(crate::ROCKET_IDENT_PREFIX)
     }
 
-    /// Create a unqiue version of the ident `self` based on the hash of `self`,
+    /// Create a unique version of the ident `self` based on the hash of `self`,
     /// its span, the current call site, and any additional information provided
     /// by the closure `f`.
     ///

core/lib/src/rocket.rs

@@ -193,7 +193,7 @@ impl Rocket<Build> {
     /// Overrides the current configuration provider with `provider`.
     ///
     /// The default provider, or a provider previously set with
-    /// [`Rocket::custom()`] or [`Rocket::reconfigure()`], is overriden by
+    /// [`Rocket::custom()`] or [`Rocket::reconfigure()`], is overridden by
     /// `provider`.
     ///
     /// # Example

core/lib/src/sentinel.rs

@@ -353,7 +353,7 @@ pub struct Sentry {
 }
 
 impl Sentry {
-    /// Returns the type ID of the resolved sentinal type.
+    /// Returns the type ID of the resolved sentinel type.
     ///
     /// # Example
     ///
@@ -368,7 +368,7 @@ impl Sentry {
         self.type_id
     }
 
-    /// Returns the type name of the resolved sentinal type.
+    /// Returns the type name of the resolved sentinel type.
     ///
     /// # Example
     ///