docs(Analysis.Analytic.IsolatedZeros): Fix name of referenced theorem (leanprover-community#30433)

Fix the docstring for AnalyticOnNhd.preimage_mem_codiscreteWithin, the theorem to see also was missing "mem" in its name.

Author: ajirving

Mathlib/Analysis/Analytic/IsolatedZeros.lean

@@ -342,8 +342,8 @@ theorem AnalyticAt.map_nhdsNE {x : 𝕜} {f : 𝕜 → E} (hfx : AnalyticAt 𝕜
 Preimages of codiscrete sets: if `f` is analytic on a neighbourhood of `U` and not locally constant,
 then the preimage of any subset codiscrete within `f '' U` is codiscrete within `U`.
 
-See `AnalyticOnNhd.preimage_zero_codiscreteWithin` for the special case that `s` is the complement
-of zero. Applications might want to use the theorem `Filter.codiscreteWithin.mono`.
+See `AnalyticOnNhd.preimage_zero_mem_codiscreteWithin` for the special case that `s` is the
+complement of zero. Applications might want to use the theorem `Filter.codiscreteWithin.mono`.
 -/
 theorem AnalyticOnNhd.preimage_mem_codiscreteWithin {U : Set 𝕜} {s : Set E} {f : 𝕜 → E}
     (hfU : AnalyticOnNhd 𝕜 f U) (h₂f : ∀ x ∈ U, ¬EventuallyConst f (𝓝 x))