doc: notes: rework --[no-]stripspace

Document this option by copying the bullet list from git-stripspace(1). A bullet list is cleaner when there are this many points to consider. We also get a more standardized description of the multiple-blank-lines behavior. Compare the repeating (git-notes(1)): empty lines other than a single line between paragraphs With (git-stripspace(1)): multiple consecutive empty lines And: leading [...] whitespace With: empty lines from the beginning Leading whitespace in the form of spaces (indentation) are not removed. However, empty lines at the start of the message are removed. Note that we drop the mentions of comment line handling because they are wrong; this option does not control how lines which can be recognized as comment lines are handled. Only interactivity controls that: • Comment lines are stripped after editing interactively • Lines which could be recognized as comment lines are left alone when the message is given non-interactively So it is misleading to document the comment line behavior on this option. Further, the text is wrong: Lines starting with `#` will be stripped out in non-editor cases like `-m`, [...] Comment lines are still indirectly discussed on other options. We will deal with them in the next commit. Signed-off-by: Kristoffer Haugsbakk <code@khaugsbakk.name> Signed-off-by: Junio C Hamano <gitster@pobox.com>