webdocs: add fetch operation to Makefile
webdocs: add fetch operation to Makefile

Change-Id: I2f85db3a37c7d94780759c35c35f959edeea133f
Signed-off-by: Stephane Desneux <94d5c471d7125b04aaf7f10fd5b446f8b0fa7a5f@iot.bzh>

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