manuals: delete unmaintained history sections

This deletes the history sections in each sub-manual,
which didn't add any value, given that they didn't list
the changes from one Yocto Project version to the next.

(From yocto-docs rev: 29ce5b89c438079793cc6457401b6a9275db877a)

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

documentation/test-manual/history.rst

@@ -1,16 +0,0 @@
-.. SPDX-License-Identifier: CC-BY-SA-2.0-UK
-
-***********************
-Manual Revision History
-***********************
-
-.. list-table::
-   :widths: 10 15 40
-   :header-rows: 1
-
-   * - Revision
-     - Date
-     - Note
-   * - 3.2
-     - October 2020
-     - The initial document released with the Yocto Project 3.2 Release

documentation/test-manual/index.rst

@@ -15,6 +15,5 @@ Yocto Project Test Environment Manual
    understand-autobuilder
    reproducible-builds
    yocto-project-compatible
-   history
 
 .. include:: /boilerplate.rst