Fix doc strings.

src/manifolds/SymplecticGrassmann.jl

@@ -81,8 +81,8 @@ is a point on the [`SymplecticStiefel`](@ref) manifold and ``X,Y \in \mathrm{Hor
 are horizontal tangent vectors. The formula reads according to Proposition Lemma 4.8 [BendokatZimmermann:2021](@cite).
 
 ```math
-g^{\mathrm{SpGr}_p(X,Y) = \operatorname{tr}\bigl(
-        (p^{\mathrm{T}p)^{-1}X^{\mathrm{T}}(I_{2n} - pp^+)Y
+g^{\mathrm{SpGr}}_p(X,Y) = \operatorname{tr}\bigl(
+        (p^{\mathrm{T}}p)^{-1}X^{\mathrm{T}}(I_{2n} - pp^+)Y
     \bigr),
 ```
 where ``I_{2n}`` denotes the identity matrix and ``(⋅)^+`` the [`symplectic_inverse`](@ref).

src/manifolds/SymplecticGrassmannStiefel.jl

@@ -91,8 +91,8 @@ Then the Riemannian gradient ``X = \operatorname{grad} f(p)`` is given by
   X = J_{2n}^THJ_{2k}p^{\mathrm{T}}p - J_{2n}^TpJ_{2k}H^{\mathrm{T}}p,
 ```
 
-where ``J_{2n}`` denotes the [`SymplecticElement`)(@ref), and
-``H = (I_{2n} - pp^+)J_{2n}^{\mathrm{T}YJ``.
+where ``J_{2n}`` denotes the [`SymplecticElement`](@ref), and
+``H = (I_{2n} - pp^+)J_{2n}^{\mathrm{T}}YJ``.
 """
 function riemannian_gradient(::SymplecticGrassmann, p, Y; kwargs...)
     n, k = get_parameter(M.size)