overview-manual: correct the bitbake tasks map section and diagram to account for sources in UNPACKDIR

(From yocto-docs rev: 52a6a642b56beb3dcf22de5ff9568f50ac138500)

Signed-off-by: Alexander Kanavin <alex@linutronix.de>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

documentation/overview-manual/concepts.rst

@@ -2368,8 +2368,6 @@ The contents of ``libhello_0.1.bb`` are::
    # Change <username> accordingly
    SRC_URI = "git://github.com/<username>/libhello;branch=main;protocol=https"
 
-   S = "${WORKDIR}/git"
-
    do_install(){
       install -d ${D}${includedir}
       install -d ${D}${libdir}
@@ -2394,8 +2392,6 @@ The contents of ``sayhello_0.1.bb`` are::
    DEPENDS += "libhello"
    RDEPENDS:${PN} += "libhello"
 
-   S = "${WORKDIR}/git"
-
    do_install(){
       install -d ${D}/usr/bin
       install -m 0700 sayhello ${D}/usr/bin