Fix comment typos

[abhinav]

Fix a couple typos in comments.
These typos were reported by https://goreportcard.com/.

fxevent/event.go
Line 163: warning: "succeded" is a misspelling of "succeeded" (misspell)
Line 209: warning: "succeded" is a misspelling of "succeeded" (misspell)

fxtest/lifecycle.go
Line 36: warning: "degarde" is a misspelling of "degrade" (misspell)

annotated_test.go
Line 915: warning: "Exmaple" is a misspelling of "Example" (misspell)

[codecov]

Codecov Report

Merging #907 (d3d541c) into master (efcfaff) will not change coverage.
The diff coverage is n/a.

❗ Current head d3d541c differs from pull request most recent head 1ee05c4. Consider uploading reports for the commit 1ee05c4 to get more accurate results

@@           Coverage Diff           @@
##           master     #907   +/-   ##
=======================================
  Coverage   98.71%   98.71%           
=======================================
  Files          30       30           
  Lines        1328     1328           
=======================================
  Hits         1311     1311           
  Misses         11       11           
  Partials        6        6           

Impacted Files	Coverage Δ
fxevent/event.go	100.00% <ø> (ø)
fxtest/lifecycle.go	100.00% <ø> (ø)

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