Renumber chapters

At present the 'chapter 1' source appears as chapter 4 due to unwanted
headings in the source files. Also the references section is shown as
its own chapter.

Correct these problems by dropping the heading structures.

Signed-off-by: Simon Glass <[email protected]>

Author: sjg20

Diff for: source/acknowledgements.rst

@@ -1,7 +1,6 @@
 .. SPDX-License-Identifier: Apache-2.0
 
-Acknowledgements
-================
+**Acknowledgements**
 
 FIT (Flattened Image Tree) was developed in 2008 by Marian Balakowicz and
 Bartlomiej Sieka of :index:`Semihalf`, under the guidance of Wolfgang Denk,

Diff for: source/license.rst

@@ -1,10 +1,6 @@
 .. SPDX-License-Identifier: Apache-2.0
 
-License
-=======
-
-Copyright
----------
+**Copyright**
 
 | Copyright 2008 Marian Balakowicz <[email protected]>
 | Copyright 2008 Bartlomiej Sieka <[email protected]>
@@ -27,8 +23,7 @@ provision, should be addressed to:
 | Sunnyvale, CA 94085
 | United States
 
-License Information
--------------------
+**License Information**
 
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.

Diff for: source/references.rst

@@ -1,6 +1,3 @@
 .. SPDX-License-Identifier: Apache-2.0
 
-References
-==========
-
 .. [dtspec] https://www.devicetree.org/specifications/

Diff for: source/revhistory.rst

@@ -1,7 +1,6 @@
 .. SPDX-License-Identifier: Apache-2.0
 
-Revision History
-================
+**Revision History**
 
 .. _revision-history:
 .. tabularcolumns:: | p{1.5cm} p{2.25cm} p{11.50cm} |