Remove empty doctest lines

Author: Matthias Koeppe

src/sage/modular/modform_hecketriangle/hecke_triangle_group_element.py

@@ -117,7 +117,6 @@ def __init__(self, parent, M, check=True, **kwargs):
 
         EXAMPLES::
 
-            sage:
             sage: from sage.modular.modform_hecketriangle.hecke_triangle_groups import HeckeTriangleGroup, HeckeTriangleGroupElement
             sage: lam = PolynomialRing(ZZ, 'lam').gen()
             sage: M = matrix([[-1, 0], [-lam^4 + 5*lam^2 + lam - 5, -1]])

src/sage/symbolic/expression_conversion_sympy.py

@@ -129,7 +129,6 @@ def symbol(self, ex):
         """
         EXAMPLES::
 
-            sage:
             sage: from sage.symbolic.expression_conversions import SympyConverter
             sage: s = SympyConverter()
             sage: s.symbol(x)
@@ -144,7 +143,6 @@ def relation(self, ex, op):
         """
         EXAMPLES::
 
-            sage:
             sage: import operator
             sage: from sage.symbolic.expression_conversions import SympyConverter
             sage: s = SympyConverter()

src/sage/topology/simplicial_complex_examples.py

@@ -1423,7 +1423,6 @@ def RandomTwoSphere(n):
 
     EXAMPLES::
 
-        sage:
         sage: G = simplicial_complexes.RandomTwoSphere(6); G
         Simplicial complex with vertex set (0, 1, 2, 3, 4, 5) and 8 facets
         sage: G.homology()                                                              # needs sage.modules

src/sage/topology/simplicial_set.py

@@ -2382,7 +2382,6 @@ def coproduct(self, *others):
             sage: Y = S2.unset_base_point()
             sage: Z = K.unset_base_point()
 
-            sage:
             sage: S2.coproduct(K).is_pointed()
             True
             sage: S2.coproduct(K)