message: doc: update syncer and watcher API url
diff: @@ -36,11 +36,11 @@ const matic = new Matic({
  // Syncer API URL
  // Fetches tx/receipt proof data instead of fetching whole block on client side
  - syncerUrl: <syncer-url>, // (optional)
  + syncerUrl: 'https://eth-syncer.api.matic.network/api/v1', // (optional)
  // Watcher API URL
  // Fetches headerBlock info from mainchain & finds appropriate headerBlock for given blockNumber
  - watcherUrl: <watcher-url>, // (optional)
  + watcherUrl: 'https://eth-watcher.api.matic.network/api/v1', // (optional)
  })
  // Set wallet
  