Tweak some docstrings

src/map/alghom.jl

@@ -61,7 +61,7 @@ end
     compose(f::AbstractAlgebra.Map(Singular.SAlgHom),
                          g::AbstractAlgebra.Map(Singular.SAlgHom))
 
-Returns an algebra homomorphism $h: domain(f) --> codomain(g)$,
+Returns an algebra homomorphism $h: domain(f) \to codomain(g)$,
 where $h = g(f)$.
 """
 function compose(f::Map(SAlgHom), g::Map(SAlgHom))
@@ -131,9 +131,9 @@ end
 ###############################################################################
 
 @doc Markdown.doc"""
-    Algebra_Homomorphism(D::PolyRing, C::PolyRing, V::Vector)
+    AlgebraHomomorphism(D::PolyRing, C::PolyRing, V::Vector)
 
-Constructs an algebra homomorphism $f: D --> C$, where the $i$-th variable of
+Constructs an algebra homomorphism $f: D \to C$, where the $i$-th variable of
 $D$ is mapped to the $i$-th entry of $V$. $D$ and $C$ must be polynomial
 rings over the same base ring.
 """

src/map/idalghom.jl

@@ -102,7 +102,8 @@ function preimage(f::Map(SIdAlgHom), I::sideal)
 end
 
 @doc Markdown.doc"""
-   kernel(f::AbstractAlgebra.Map(SIdAlgHom))
+    kernel(f::AbstractAlgebra.Map(SIdAlgHom))
+
 Returns the kernel of the identity algebra homomorphism.
 """
 function kernel(f::Map(SIdAlgHom))
@@ -116,8 +117,9 @@ end
 ################################################################################
 
 @doc Markdown.doc"""
-   Identity_Algebra_Homomorphism(R::PolyRing)
-Constructs the canonical identity algebra homomorphism $id: D --> D$,
+    IdentityAlgebraHomomorphism(R::PolyRing)
+
+Constructs the canonical identity algebra homomorphism $id: D \to D$,
 where the $i$-th variable of $D$ is mapped to itself.
 """
 IdentityAlgebraHomomorphism(R::PolyRing)  = SIdAlgHom{typeof(R.base_ring)}(R)