manuals: Rename the "Using .bbappend Files in Your Layer" section

To prepare to add another example bbappend, rename the current "Using
.bbappend Files in Your Layer" section to "Appending Other Layers Metadata
With Your Layer". Name the current example as "Overlaying a File Using
Your Layer".

(From yocto-docs rev: 62d7b5721b2fbcf1e22fc4e7bbac51d52260730e)

Signed-off-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Michael Opdenacker <michael.opdenacker@bootlin.com>
Reviewed-by: Quentin Schulz <foss@0leil.net>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

documentation/dev-manual/common-tasks.rst

@@ -443,8 +443,8 @@ file. During the processing of each ``conf/layer.conf`` file, BitBake
 adds the recipes, classes and configurations contained within the
 particular layer to the source directory.
 
-Using .bbappend Files in Your Layer
------------------------------------
+Appending Other Layers Metadata With Your Layer
+-----------------------------------------------
 
 A recipe that appends Metadata to another recipe is called a BitBake
 append file. A BitBake append file uses the ``.bbappend`` file type
@@ -474,6 +474,9 @@ does not have a corresponding recipe with a matching name. See the
 :term:`BB_DANGLINGAPPENDS_WARNONLY`
 variable for information on how to handle this error.
 
+Overlaying a File Using Your Layer
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
 As an example, consider the main formfactor recipe and a corresponding
 formfactor append file both from the :term:`Source Directory`.
 Here is the main
@@ -6091,7 +6094,7 @@ layer. The following steps provide some more detail:
 
    -  Add a ``psplash`` append file for a branded splash screen. For
       information on append files, see the
-      ":ref:`dev-manual/common-tasks:using .bbappend files in your layer`"
+      ":ref:`dev-manual/common-tasks:appending other layers metadata with your layer`"
       section.
 
    -  Add any other append files to make custom changes that are