some doc fixes

docs/js/lang.md

@@ -1,27 +1 @@
 # JavaScript and TypeScript
-
-You can write micro:bit programs in a subset of [TypeScript](https://www.typescriptlang.org), a superset of JavaScript.
-Many micro:bit programs, especially at the beginner's level, are just plain JavaScript. TypeScript introduces class-based 
-object-oriented programming, such as:
-
-```typescript
-class Greeter {
-    greeting: string;
-    constructor(message: string) {
-        this.greeting = message;
-    }
-    greet() {
-        return "Hello, " + this.greeting;
-    }
-}
-
-let greeter = new Greeter("world");
-basic.showString(greeter.greet())
-```
-
-This site is meant for teaching programming first, and JavaScript second. For this
-reason, we have stayed away from concepts that are specific to JavaScript (for
-example, prototype inheritance), and instead focused on ones common to most
-modern programming languages (lexically scoped variables, functions, classes).
-We leverage TypeScript's [type inference](/js/inference) so that
-students need not specify types when clear from context.

docs/js/operators.md

@@ -1,8 +1,11 @@
 ## Operators
 
 The following JavaScript operators are supported for the micro:bit.
+
+### ~hint
 Note that for the micro:bit all arithmetic is performed on integers, rather than floating point.
 This also is true when simulating in the browser.
+### ~
 
 # Assignment, arithmetic and bitwise
 
@@ -22,6 +25,6 @@ This also is true when simulating in the browser.
 * strings, with a few common methods
 * [string templates](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Template_literals) (`` `x is ${x}` ``)
 
-### ~button /js/controlflow
+### ~button /js/statements
-NEXT: Control Flow
+NEXT: Statements
 ### ~

docs/js/sequence.md

@@ -42,11 +42,15 @@ followed by a call to `showNumber` that will never execute:
 ```typescript
 while(true) ;  basic.showNumber(1);
 ```
+
+
+### ~hint
 For the micro:bit, we don't allow a program to contain an empty statement, such as shown above. 
 If you really want an empty statement, you need to use curly braces to delimit an empty statement block:
 ```typescript
 while(true) { } basic.showNumber(1);
 ```
+### ~
 
 [Read more](http://inimino.org/~inimino/blog/javascript_semicolons) about semicolons in JavaScript.
 

docs/js/variables.md

@@ -116,6 +116,6 @@ const numLivesForCat = 9;
 They are like `let` declarations but, as their name implies, their value cannot be changed once they are bound.
 In other words, they have the same scoping rules as `let`, but you can't re-assign to them.
 
-### ~button /js/expressions
+### ~button /js/operators
-NEXT: Expressions
+NEXT: Operators
 ### ~