Trivial: docs: Remove six-space indentation in REPORTING-BUGS.

Other paragraph format docs in Documentation don't use paragraph
indentations, so conform REPORTING-BUGS to that.

Re-wrap the paragraphs, keeping the doc to a 74-character line length,
since that's what the original seemed to use.

Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>