Misc heading fixes

tutorials/3d/fps_tutorial/part_five.rst

@@ -3,7 +3,7 @@
 Part 5
 ======
 
-Part Overview
+Part overview
 -------------
 
 In this part, we're going to add grenades to the player, give the player the ability to grab and throw objects, and add turrets!

tutorials/3d/fps_tutorial/part_four.rst

@@ -3,7 +3,7 @@
 Part 4
 ======
 
-Part Overview
+Part overview
 -------------
 
 In this part, we will be adding health pickups, ammo pickups, targets the player can destroy, support for joypads, and add the ability to change weapons with the scroll wheel.

tutorials/3d/fps_tutorial/part_one.rst

@@ -63,7 +63,7 @@ Feel free to use these assets however you want! All original assets belong to th
 
 .. tip:: You can find the finished project for each part at the bottom of each part's page
 
-Part Overview
+Part overview
 -------------
 
 In this part we will be making a first person player that can move around
@@ -76,6 +76,7 @@ sprint, look around with a mouse based first person camera, jump into the air, a
 
 Getting everything ready
 ------------------------
+
 Launch Godot and open up the project included in the starter assets.
 
 .. note:: While these assets are not necessarily required to use the scripts provided in this tutorial,

tutorials/3d/fps_tutorial/part_six.rst

@@ -3,7 +3,7 @@
 Part 6
 ======
 
-Part Overview
+Part overview
 -------------
 
 In this part, we're going to add a main menu and pause menu,

tutorials/3d/fps_tutorial/part_three.rst

@@ -3,7 +3,7 @@
 Part 3
 ======
 
-Part Overview
+Part overview
 -------------
 
 In this part, we will be limiting the player's weapons by giving them ammo. We will also

tutorials/3d/fps_tutorial/part_two.rst

@@ -3,7 +3,7 @@
 Part 2
 ======
 
-Part Overview
+Part overview
 -------------
 
 In this part we will be giving our player weapons to play with.