Few small fixes

spec/compiler/semantic/instance_var_spec.cr

@@ -4686,7 +4686,7 @@ describe "Semantic: instance var" do
     )) { tuple_of([int32, int32]) }
   end
 
-  it "errors if assigning instance variable at top level block" do
+  it "errors when assigning instance variable at top level block" do
     assert_error %(
       def foo
         yield
@@ -4699,25 +4699,12 @@ describe "Semantic: instance var" do
       "can't use instance variables at the top level"
   end
 
-  it "errors when assigning instance variable at top level block" do
+  it "errors when assigning instance variable at top level control block" do
     assert_error %(
-      def foo
-        yield
-      end
-
-      foo do
+      if true
         @foo = 1
       end
       ),
       "can't use instance variables at the top level"
   end
-
-  it "errors when assigning instance variable at top level control block" do
-    assert_error %(
-    if true
-      @foo = 1
-    end
-    ),
-      "can't use instance variables at the top level"
-  end
 end

src/object.cr

@@ -194,7 +194,7 @@ class Object
   # 1.234_f64.unsafe_as(Int64) # => 4608236261112822104
   # ```
   #
-  # This method is **unsafe** becuase it behaves unpredictably when the given
+  # This method is **unsafe** because it behaves unpredictably when the given
   # `type` doesn't have the same bytesize as the receiver, or when the given
   # `type` representation doesn't semantically match the underlying bytes.
   #