Fix typos

Author: noti0na1

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

@@ -769,7 +769,7 @@ class TypeComparer(@constructorOnly initctx: Context) extends ConstraintHandling
             // `Mode.RelaxedOverriding` is only enabled when checking Java overriding
             // in explicit nulls, and `Null` becomes a bottom type, which allows
             // `T | Null` being a subtype of `T`.
-            // A type varibale `T` from Java is translated to `T >: Nothing <: Any`.
+            // A type variable `T` from Java is translated to `T >: Nothing <: Any`.
             // However, `null` can always be a value of `T` for Java side.
             // So the best solution here is to let `Null` be bottom type temporarily.
             def isNullable(tp: Type): Boolean = ctx.mode.is(Mode.RelaxedOverriding) || {

compiler/src/dotty/tools/dotc/transform/OverridingPairs.scala

@@ -217,7 +217,7 @@ object OverridingPairs:
       )
     else
       // releaxed override check for explicit nulls if one of the symbols is Java defined,
-      // force `Null` being a bottom types during override checking.
+      // force `Null` to be a bottom type during override checking.
       val overrideCtx = if ctx.explicitNulls && (member.is(JavaDefined) || other.is(JavaDefined))
         then ctx.retractMode(Mode.SafeNulls).addMode(Mode.RelaxedOverriding) else ctx
       member.name.is(DefaultGetterName) // default getters are not checked for compatibility

compiler/src/dotty/tools/dotc/transform/ResolveSuper.scala

@@ -112,8 +112,8 @@ object ResolveSuper {
         val otherTp = other.asSeenFrom(base.typeRef).info
         val accTp = acc.asSeenFrom(base.typeRef).info
         // Since the super class can be Java defined,
-        // we use releaxed overriding check for explicit nulls if one of the symbols is Java defined.
-        // This forces `Null` being a bottom type during override checking.
+        // we use relaxed overriding check for explicit nulls if one of the symbols is Java defined.
+        // This forces `Null` to be a bottom type during override checking.
         val overrideCtx = if ctx.explicitNulls && (sym.is(JavaDefined) || acc.is(JavaDefined))
           then ctx.retractMode(Mode.SafeNulls).addMode(Mode.RelaxedOverriding) else ctx
         if !otherTp.overrides(accTp, matchLoosely = true)(using overrideCtx) then