`common` Update docstring

/**
 * Scopes an array of data based on a JSONPath, a function, or an object.
 * Useful when the source data has `n` items you would like to map to
 * an operation.
 * The operation will receive a slice of the data based on each item
 * of the JSONPath, function result, or the provided object.
 *
 * Note: It's the responsibility of the provided operation to ensure that
 * the results make their way back into the state's references.
 *
 * It should be designed to handle each item in the scoped data.
 * The Promise resolves after applying the operation on each item in the scoped data.
 * @public
 * @example <caption>Using JSONPath referencing a point in `state`</caption>
 * each("$.data.users[*]",
 *   create("SObject",
 *     field("FirstName", sourceValue("$.firstName"))
 *   )
 * )
 *
 * @example <caption>Using a function to be called with `state`</caption>
 * each(state=> state.data.users,
 *   create("SObject",
 *     field("FirstName", sourceValue("$.firstName"))
 *   )
 * )
 * @example <caption>Using an Object Literal of the data itself.</caption>
 * each(dataValue('users'),
 *   create("SObject",
 *     field("FirstName", sourceValue("$.firstName"))
 *   )
 * )
 *
 * @function
 *
 * @param {String|Function|Object} dataSource - JSONPath referencing a point in `state`, a function that takes state and returns an array of data, or an object representing data itself.
 *   - If a string, it represents a JSONPath pointing to a location in the `state` object.
 *   - If a function, it should take the `state` as an argument and return an array of data.
 *   - If an object, it returns an Object Literal of the data itself.
 *
 * @param {Function} operation -  The operation that takes `state` and returns a modified `state`.
 *
 * @returns {Operation}
 */
export function each(dataSource, operation) {// Implementation of the function goes here }