Fix niceness gate

Current doc8 complains about:
doc/hot-guide/source/software_deployment.rst:453: D005 No newline at end
of file
doc/common/samples/xml_curl.txt:7: D005 No newline at end of file
doc/user-guide/samples/xml_curl.txt:7: D005 No newline at end of file

Add new lines

Change-Id: Ic8da4ba77446bc88de75e07c0e45d5ab09136538