Fix doctests in AffineSchemes.

src/AlgebraicGeometry/Schemes/AffineSchemes/Morphisms/Attributes.jl

@@ -46,7 +46,7 @@ Affine scheme morphism
   from [x1, x2, x3]  scheme(x1)
   to   [x1, x2, x3]  affine 3-space over QQ
 given by the pullback function
-  x1 -> 0
+  x1 -> x1
   x2 -> x2
   x3 -> x3
 
@@ -95,7 +95,7 @@ Affine scheme morphism
   from [x1, x2, x3]  scheme(x1)
   to   [x1, x2, x3]  affine 3-space over QQ
 given by the pullback function
-  x1 -> 0
+  x1 -> x1
   x2 -> x2
   x3 -> x3
 
@@ -143,7 +143,7 @@ Ring homomorphism
   from multivariate polynomial ring in 3 variables over QQ
   to quotient of multivariate polynomial ring by ideal (x1)
 defined by
-  x1 -> 0
+  x1 -> x1
   x2 -> x2
   x3 -> x3
 ```
@@ -254,7 +254,7 @@ Affine scheme morphism
   from [x1, x2, x3]  scheme(x1)
   to   [x1, x2, x3]  affine 3-space over QQ
 given by the pullback function
-  x1 -> 0
+  x1 -> x1
   x2 -> x2
   x3 -> x3
 

src/AlgebraicGeometry/Schemes/AffineSchemes/Morphisms/Constructors.jl

@@ -132,7 +132,7 @@ Affine scheme morphism
   from [x1, x2, x3]  scheme(x1)
   to   [x1, x2, x3]  affine 3-space over QQ
 given by the pullback function
-  x1 -> 0
+  x1 -> x1
   x2 -> x2
   x3 -> x3
 
@@ -181,7 +181,7 @@ Affine scheme morphism
   from [x1, x2, x3]  scheme(x1)
   to   [x1, x2, x3]  affine 3-space over QQ
 given by the pullback function
-  x1 -> 0
+  x1 -> x1
   x2 -> x2
   x3 -> x3
 

src/AlgebraicGeometry/Schemes/AffineSchemes/Objects/Attributes.jl

@@ -234,7 +234,7 @@ Affine scheme morphism
   from [x, y]  scheme(x)
   to   [x, y]  affine 2-space over QQ
 given by the pullback function
-  x -> 0
+  x -> x
   y -> y
 
 julia> inc == inclusion_morphism(Y, X)