dt-bindings: fpga: Replace HTTP links with HTTPS ones

Rationale:
Reduces attack surface on kernel devs opening the links for MITM
as HTTPS traffic is much harder to manipulate.

Deterministic algorithm:
For each file:
  If not .svg:
    For each line:
      If doesn't contain `\bxmlns\b`:
        For each link, `\bhttp://[^# \t\r\n]*(?:\w|/)`:
	  If neither `\bgnu\.org/license`, nor `\bmozilla\.org/MPL\b`:
            If both the HTTP and HTTPS versions
            return 200 OK and serve the same content:
              Replace HTTP with HTTPS.
Signed-off-by: Alexander A. Klimov <grandmaster@al2klimov.de>
Link: https://lore.kernel.org/r/20200713134008.34635-1-grandmaster@al2klimov.deSigned-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/fpga/fpga-region.txt

@@ -493,4 +493,4 @@ FPGA Bridges that exist on the FPGA fabric prior to the partial reconfiguration.
 --
 [1] www.altera.com/content/dam/altera-www/global/en_US/pdfs/literature/ug/ug_partrecon.pdf
 [2] tspace.library.utoronto.ca/bitstream/1807/67932/1/Byma_Stuart_A_201411_MAS_thesis.pdf
-[3] http://www.xilinx.com/support/documentation/sw_manuals/xilinx14_1/ug702.pdf
+[3] https://www.xilinx.com/support/documentation/sw_manuals/xilinx14_1/ug702.pdf