doc: develop: sending_patches: fix links to pw-am.sh

The OpenEmbedded wiki doesn't reside at that address (it does at
https://www.openembedded.org/wiki/) but it's unclear what it's useful
for to link to it so instead let's remove the link.

The related pw-am.sh script cannot be found at that address, however it
is available at a new address so let's use that though OE-Core lists it
among the Outdated information in its wiki[1].

[1] https://www.openembedded.org/wiki/Patchwork#Outdated

Signed-off-by: Quentin Schulz <[email protected]>

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