fixes in the newly added documentation

Author: fchapoton

src/sage/algebras/exterior_algebra_groebner.pyx

@@ -438,6 +438,8 @@ cdef class GroebnerStrategy:
         """
         Convert the computed Gröbner basis to a reduced Gröbner basis.
 
+        EXAMPLES::
+
             sage: E.<x,y,z> = ExteriorAlgebra(QQ)
             sage: I = E.ideal([x+y*z])
             sage: I.groebner_basis(reduced=False)

src/sage/graphs/graph_decompositions/fast_digraph.pyx

@@ -90,7 +90,7 @@ cdef class FastDigraph:
 
     def print_adjacency_matrix(self):
         r"""
-        Displays the adjacency matrix of ``self``.
+        Display the adjacency matrix of ``self``.
 
         EXAMPLES::
 

src/sage/matroids/union_matroid.pyx

@@ -1,3 +1,6 @@
+"""
+Union of matroids
+"""
 from sage.matroids.matroid cimport Matroid
 
 cdef class MatroidUnion(Matroid):

src/sage/modular/hypergeometric_misc.pyx

@@ -1,6 +1,7 @@
 """
-Some utility routines for the hypergeometric motives package that benefit
-significantly from Cythonization.
+Utility routines for hypergeometric motives
+
+These are functions that benefit significantly from Cythonization.
 """
 from cpython cimport array
 from cysignals.signals cimport sig_check

src/sage/modular/modform/l_series_gross_zagier.py

@@ -1,3 +1,6 @@
+"""
+Gross-Zagier L-series
+"""
 from sage.rings.integer import Integer
 from sage.structure.sage_object import SageObject
 from sage.lfunctions.dokchitser import Dokchitser

src/sage/modular/modform/l_series_gross_zagier_coeffs.pyx

@@ -1,3 +1,6 @@
+"""
+Utilities for Gross-Zagier L-series
+"""
 from cysignals.memory cimport check_allocarray, check_calloc, sig_free
 from cysignals.signals cimport sig_check, sig_on, sig_off
 
@@ -14,7 +17,7 @@ from libc.string cimport memcpy
 
 cpdef to_series(L, var):
     """
-    Create a power series element out of a list ``L`` in the variable`` var``.
+    Create a power series element out of a list ``L`` in the variable ``var``.
 
     EXAMPLES::
 
@@ -42,7 +45,7 @@ def bqf_theta_series(Q, long bound, var=None):
 
     .. MATH::
 
-        \sum_{(x,y) \in \Z^2} q^{f(x,y)} = \sum_{n=-\infty}^{\infty} r(n)q^n
+        \sum_{(x,y) \in \ZZ^2} q^{f(x,y)} = \sum_{n=-\infty}^{\infty} r(n)q^n
 
     where `r(n)` give the number of way `n` is represented by `f`.