chore(Analysis/InnerProductSpace): remove misleading comment (#42123)

The comment makes no sense any more: `noncomputable section` checks first if a def is computable, and only if not, makes it noncomputable. So `noncomputable section` wouldn't make a difference here (for an example where `noncomputable def` vs `noncomputable section` makes a difference see [#mathlib4 > noncomputable section @ 💬](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/noncomputable.20section/near/609434583)).

Looking at the git history, it used to be marked `noncomputable def`, but that was removed in #40091 without comment. This is not a performance issue any more, so the comment can just be removed.

Co-authored-by: Batixx <s59fpern@uni-bonn.de>

Author: felixpernegger

Mathlib/Analysis/InnerProductSpace/Adjoint.lean

@@ -68,8 +68,6 @@ namespace ContinuousLinearMap
 
 variable [CompleteSpace E] [CompleteSpace G]
 
--- Note: made noncomputable to stop excess compilation
--- https://github.com/leanprover-community/mathlib4/issues/7103
 /-- The adjoint, as a continuous conjugate-linear map. This is only meant as an auxiliary
 definition for the main definition `adjoint`, where this is bundled as a conjugate-linear isometric
 equivalence. -/