fix(docs): typo in the lazy-loading section

[raminjafary]

I suppose errorListener should be called on this in the following example:

  mounted() {
    // This will only load sentry once an error was thrown
    // To prevent a chicken & egg issue, make sure to also
    // set injectMock: true if you use this so the error
    // that triggered the load will also be captured
    this.errorListener = () => {
      this.$sentryLoad()
      window.removeEventListener('error', errorListener)
    }
    window.addEventListener('error', errorListener)
  },
  destroyed() {
    window.removeEventListener('error', this.errorListener)
  }

[codecov]

Codecov Report

Merging #363 (e9890ed) into master (0aeba6e) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #363   +/-   ##
=======================================
  Coverage   74.46%   74.46%           
=======================================
  Files           1        1           
  Lines          47       47           
  Branches       21       21           
=======================================
  Hits           35       35           
  Misses          9        9           
  Partials        3        3           

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[rchl]

Thanks.