Clarify the effect of individual hooks

lib/model.js

@@ -1438,7 +1438,7 @@ module.exports = (function() {
    * @param  {Object}       options
    * @param  {Object}       [options.where]                 Filter the destroy
    * @param  {Boolean}      [options.hooks=true]            Run before / after bulk destroy hooks?
-   * @param  {Boolean}      [options.individualHooks=false] If set to true, destroy will find all records within the where parameter and will execute before / after bulkDestroy hooks on each row
+   * @param  {Boolean}      [options.individualHooks=false] If set to true, destroy will SELECT all records matching the where parameter and will execute before / after destroy hooks on each row
    * @param  {Number}       [options.limit]                 How many rows to delete
    * @param  {Boolean}      [options.force=false]           Delete instead of setting deletedAt to current timestamp (only applicable if `paranoid` is enabled)
    * @param  {Boolean}      [options.truncate=false]        If set to true, dialects that support it will use TRUNCATE instead of DELETE FROM. If a table is truncated the where and limit options are ignored
@@ -1584,7 +1584,7 @@ module.exports = (function() {
    * @param  {Object        options.where                   Options to describe the scope of the search.
    * @param  {Boolean}      [options.validate=true]         Should each row be subject to validation before it is inserted. The whole insert will fail if one row fails validation
    * @param  {Boolean}      [options.hooks=true]            Run before / after bulk update hooks?
-   * @param  {Boolean}      [options.individualHooks=false] Run before / after update hooks?
+   * @param  {Boolean}      [options.individualHooks=false] Run before / after update hooks?. If true, this will execute a SELECT followed by individual UPDATEs. A select is needed, because the row data needs to be passed to the hooks
    * @param  {Boolean}      [options.returning=false]       Return the affected rows (only for postgres)
    * @param  {Number}       [options.limit]                 How many rows to update (only for mysql and mariadb)
    * @param  {Transaction}  [options.transaction]