Rationale

Technical improvements (some of these improvements are in response to comments from 2021 ballot that qualified as technical rather than editorial changes): * correction of risk value in section 3.1.11.1 * adding Note 5 * revision of formulas 22 and 23, adding clarification under the formulas 23, 25 and 26 * correction of Table 12, * correction of rounding for value V0 in example 13.3 for consistency with other calculations * adding reference 14 Editorial corrections of typos and renumbering of items due to addition of note and reference. Improvements of language for clarity of the practice