Make tutorial page titles standard (MystenLabs#2278)

yellow0x · May 27, 2022 · 873753d · 873753d
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diff --git a/doc/src/build/programming-with-objects/ch1-object-basics.md b/doc/src/build/programming-with-objects/ch1-object-basics.md
@@ -1,4 +1,6 @@
-## Chapter 1: Object Basics
+---
+title: Chapter 1: Object Basics
+---
 
 ### Define Sui Object
 In Move, besides primitive data types, we can define organized data structures using `struct`. For example:

diff --git a/doc/src/build/programming-with-objects/ch2-using-objects.md b/doc/src/build/programming-with-objects/ch2-using-objects.md
@@ -1,4 +1,6 @@
-## Chapter 2: Using Objects
+---
+title: Chapter 2: Using Objects
+---
 
 In [Chapter 1](./ch1-object-basics.md) we covered how to define, create and take ownership of a Sui object in Move. In this chapter we will look at how to use objects that you own in Move calls.
 

diff --git a/doc/src/build/programming-with-objects/ch3-immutable-objects.md b/doc/src/build/programming-with-objects/ch3-immutable-objects.md
@@ -1,4 +1,7 @@
-## Chapter 3: Immutable Objects
+---
+title: Chapter 3: Immutable Objects
+---
+
 In chapters 1 and 2, we learned how to create and use objects owned by an account address. In this chapter, we will demonstrate how to create and use immutable objects.
 
 Objects in Sui can have different types of [ownership](../objects.md#object-ownership), with two broad categories: immutable objects and mutable objects. An immutable object is an object that can **never** be mutated, transferred or deleted. Because of this immutability, the object is not owned by anyone, and hence it can be used by anyone.

diff --git a/doc/src/build/programming-with-objects/ch4-object-wrapping.md b/doc/src/build/programming-with-objects/ch4-object-wrapping.md
@@ -1,4 +1,7 @@
-## Chapter 4: Object Wrapping
+---
+title: Chapter 4: Object Wrapping
+---
+
 In many programming languages, we organize data structures in layers by nesting complex data structures in another data structure. In Move, you may do the same by putting a field of `struct` type in another, like the following:
 ```rust
 struct Foo has key {

diff --git a/doc/src/build/programming-with-objects/ch5-child-objects.md b/doc/src/build/programming-with-objects/ch5-child-objects.md
@@ -1,4 +1,7 @@
-## Chapter 5: Child Objects
+---
+title: Chapter 5: Child Objects
+---
+
 In the previous chapter, we walked through various ways of wrapping an object in another object. There are a few limitations in object wrapping:
 1. A wrapped object can be accessed only via its wrapper. It cannot be used directly in a transaction or queried by its ID (e.g., in the explorer).
 2. An object can become very large if it wraps several other objects. Larger objects can lead to higher gas fees in transactions. In addition, there is an upper bound on object size.