doc: change effect to affect in errors.md

PR-URL: #799
Reviewed-By: Evan Lucas <evanlucas@me.com>
Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com>

doc/api/errors.markdown

@@ -163,7 +163,7 @@ Property that determines the number of stack frames collected by a stack trace
 (whether generated by `new Error().stack` or `Error.captureStackTrace(obj)`).
 
 The initial value is `10`. It may be set to any valid JavaScript number, which
-will effect any stack trace captured *after* the value has been changed. If set
+will affect any stack trace captured *after* the value has been changed. If set
 to a non-number value, stack traces will not capture any frames and will report
 `undefined` on access.