What does +11 to healing spells mean?

[enthusiast]

Tooltips aren't updated by items at all to my knowledge.  Your spells will do extra healing with that cloak equipped, but it won't always be +11.  Spells only get bonuses relative to the casting time.  The numbers have been mentioned elsewhere, but it's something like an instant cast will only get 35% (~4 for you) of the bonus, while spells of 3 seconds or longer get the full 100% (11 for you).

Alone these items might not seem that great, but combined +healing/damage really can add up.
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actually I believe the +11 wording means it will give that for all spells. The wording of "up to xx" will add according to cast time.