some typos in ScalaDoc comments

compiler/src/dotty/tools/dotc/ast/Trees.scala

@@ -161,7 +161,7 @@ object Trees {
       case _ => NoType
     }
 
-    /** The denotation referred tno by this tree.
+    /** The denotation referred to by this tree.
      *  Defined for `DenotingTree`s and `ProxyTree`s, NoDenotation for other
      *  kinds of trees
      */

compiler/src/dotty/tools/dotc/core/Names.scala

@@ -288,7 +288,7 @@ object Names {
     }
   }
 
-  /** A simple name is essentiall an interned string */
+  /** A simple name is essentially an interned string */
   final class SimpleName(val start: Int, val length: Int, @sharable private[Names] var next: SimpleName) extends TermName {
     // `next` is @sharable because it is only modified in the synchronized block of termName.
 

compiler/src/dotty/tools/dotc/core/SymbolLoaders.scala

@@ -210,7 +210,7 @@ class SymbolLoaders {
     Stats.record("package scopes")
 
     /** The scope of a package. This is different from a normal scope
-  	 *  in three aspects:
+  	 *  in two aspects:
 	   *
 	   *   1. Names of scope entries are kept in mangled form.
 	   *   2. Some function types in the `scala` package are synthesized.

compiler/src/dotty/tools/dotc/core/Symbols.scala

@@ -720,7 +720,7 @@ object Symbols {
   /** Makes all denotation operations available on symbols */
   implicit def toDenot(sym: Symbol)(implicit ctx: Context): SymDenotation = sym.denot
 
-  /** Makes all class denotations available on class symbols */
+  /** Makes all class denotation operations available on class symbols */
   implicit def toClassDenot(cls: ClassSymbol)(implicit ctx: Context): ClassDenotation = cls.classDenot
 
   /** The Definitions object */