Add usage examples in number formatting functions

Example usages for `formatVnNumber`, `formatVnCurrency` and `formatVnPercent` methods have been added to the code documentation. These examples provide clarification on how to use these number formatting functions, making it easier for other developers to understand their utility and implementation.

deno.json

@@ -1,6 +1,6 @@
 {
   "name": "@hckhanh/vn-number",
-  "version": "1.5.2",
+  "version": "1.5.3",
   "exports": "./src/index.ts",
   "exclude": [
     ".github/",

src/format/number.ts

@@ -33,6 +33,14 @@ function formatNumber(
 /**
  * Formats a number as a Vietnamese formatted number.
  *
+ * @example
+ * ```ts
+ * import { formatVnNumber } from '@hckhanh/vn-number'
+ *
+ * formatVnNumber('19990000') // or formatVnNumber(19990000)
+ * // output: 19.990.000
+ * ```
+ *
  * @param number The number to format.
  * @param fallbackValue The fallback value to use if formatting fails. Default value is `0`
  * @return The formatted number or the `fallbackValue` if formatting fails.
@@ -48,6 +56,14 @@ export function formatVnNumber(
 /**
  * Formats a value as Vietnamese Dong (VND) currency.
  *
+ * @example
+ * ```ts
+ * import { formatVnCurrency } from '@hckhanh/vn-number'
+ *
+ * formatVnCurrency('19990000') // or formatVnCurrency(19990000)
+ * // output: 19.990.000 ₫
+ * ```
+ *
  * @param money The value to format as VND currency.
  * @param fallbackValue The fallback value to return if `money` is not a valid number. Default value is `0 ₫`
  * @return The value formatted as VND currency, or the `fallbackValue` if `money` is not a valid number.
@@ -66,6 +82,14 @@ export function formatVnCurrency(
 /**
  * Formats a number or string representing value into a Vietnamese percentage format.
  *
+ * @example
+ * ```ts
+ * import { formatVnPercent } from '@hckhanh/vn-number'
+ *
+ * formatVnPercent('0.99') // or formatVnPercent(0.99)
+ * // output: 99%
+ * ```
+ *
  * @param value The value to format.
  * @param fallbackValue The fallback value to use if the `value` is invalid or not provided.
  *