doc: fix encoding of (r) character
doc: fix encoding of (r) character

Change encoding of (r) from Latin-1 to UTF8 to match the other
symbols in the doc and to allow it to convert cleanly to PDF.

Signed-off-by: John McNamara <af31595c36a4239b9676e9b3a777d3e2f15a6c4d@intel.com>
Acked-by: Bernard Iremonger <233eeff376ad0c06f66f06c5522ea3c4feb30d3b@intel.com>

phermansson/dpdk,phermansson/dpdk,phermansson/dpdk,phermansson/dpdk