add basic documentation for descriptor and algebra methods

Author: abhinavmehndiratta

src/Object_Methods/Algebra_Methods.jl

@@ -1,7 +1,7 @@
 """
     GrB_BinaryOp_new(op, fn, ztype, xtype, ytype)
 
-Initializes a new GraphBLAS binary operator with a specified user-defined function and its types.
+Initialize a new GraphBLAS binary operator with a specified user-defined function and its types.
 
 # Examples
 ```jldoctest
@@ -75,7 +75,7 @@ end
 """
     GrB_UnaryOp_new(op, fn, ztype, xtype, ytype)
 
-Initializes a new GraphBLAS unary operator with a specified user-defined function and its types.
+Initialize a new GraphBLAS unary operator with a specified user-defined function and its types.
 """
 function GrB_UnaryOp_new(
     op::GrB_UnaryOp,
@@ -105,7 +105,7 @@ end
 """
     GrB_Monoid_new(monoid, binary_op, identity)
 
-Creates a new monoid with specified binary operator and identity value.
+Create a new monoid with specified binary operator and identity value.
 """
 function GrB_Monoid_new(monoid::GrB_Monoid, binary_op::GrB_BinaryOp, identity::T) where T <: valid_int_types
     monoid_ptr = pointer_from_objref(monoid)
@@ -152,7 +152,7 @@ end
 """
     GrB_Semiring_new(semiring, monoid, binary_op)
 
-Creates a new semiring with specified monoid and binary operator.
+Create a new semiring with specified monoid and binary operator.
 """
 function GrB_Semiring_new(semiring::GrB_Semiring, monoid::GrB_Monoid, binary_op::GrB_BinaryOp)
     semiring_ptr = pointer_from_objref(semiring)

src/Object_Methods/Descriptor_Methods.jl

@@ -1,6 +1,11 @@
-function GrB_Descriptor_new(descriptor::GrB_Descriptor)
-    desc_ptr = pointer_from_objref(descriptor)
-    
+"""
+    GrB_Descriptor_new(desc)
+
+Create a new (empty or default) descriptor.
+"""
+function GrB_Descriptor_new(desc::GrB_Descriptor)
+    desc_ptr = pointer_from_objref(desc)
+
     return GrB_Info(
         ccall(
                 dlsym(graphblas_lib, "GrB_Descriptor_new"),
@@ -11,6 +16,11 @@ function GrB_Descriptor_new(descriptor::GrB_Descriptor)
         )
 end
 
+"""
+    GrB_Descriptor_set(desc, field, val)
+
+Set the content for a field for an existing descriptor.
+"""
 function GrB_Descriptor_set(desc::GrB_Descriptor, field::GrB_Desc_Field, val::GrB_Desc_Value)
     return GrB_Info(
         ccall(