[PATCH 03/17] HOWTO.rst: adjust external link references

- A few link references were missing http:// - Several sites are now redirecting to https protocol. On such cases, just use the https URL. NOTE: all URLs were checked and they're pointing to the right places. Signed-off-by: Mauro Carvalho Chehab ---

[PATCH 03/17] HOWTO.rst: adjust external link references

- A few link references were missing http:// - Several sites are now redirecting to https protocol. On such cases, just use the https URL. NOTE: all URLs were checked and they're pointing to the right places. Signed-off-by: Mauro Carvalho Chehab ---