doctools: use title specified in toc*.yml with higher priority
doctools: use title specified in toc*.yml with higher priority

When specifying a entry like this:
-----------
...
-
    name: "Development Kit: build AGL image"
    children:
        -
            name: A special title
            url: reference/sdk-devkit/docs/part-1/1_0_Abstract.html

...
-----------

the resulting TOC will contain "A special title" for the title of the document

Change-Id: I7f51c5931016c08103e5f9df966f53afdb7a9ef4
Signed-off-by: Stephane Desneux <94d5c471d7125b04aaf7f10fd5b446f8b0fa7a5f@iot.bzh>

claneys/docs-agl,leon-anavi/docs-agl,automotive-grade-linux/docs-agl,leon-anavi/docs-agl,automotive-grade-linux/docs-agl,claneys/docs-agl,leon-anavi/docs-agl,leon-anavi/docs-agl,automotive-grade-linux/docs-agl,claneys/docs-agl,automotive-grade-linux/docs-agl,claneys/docs-agl