fix doctest inside it documentation ; wrap some long lines

src/doc/it/tutorial/tour_algebra.rst

@@ -184,7 +184,7 @@ la notazione :math:`x=x_{1}`, :math:`y=x_{2}`:
 
     sage: de1 = maxima("2*diff(x(t),t, 2) + 6*x(t) - 2*y(t)")
     sage: lde1 = de1.laplace("t","s"); lde1
-    2*((-%at('diff(x(t),t,1),t=0))+s^2*'laplace(x(t),t,s)-x(0)*s)-2*'laplace(y(t),t,s)+6*'laplace(x(t),t,s)
+    2*((-%at('diff(x(t),t,1),t = 0))+s^2*'laplace(x(t),t,s)-x(0)*s) -2*'laplace(y(t),t,s)+6*'laplace(x(t),t,s)
 
 Questo è di difficile lettura, ma dice che
 
@@ -199,7 +199,7 @@ trasformata di Laplace della seconda equazione:
 
     sage: de2 = maxima("diff(y(t),t, 2) + 2*y(t) - 2*x(t)")
     sage: lde2 = de2.laplace("t","s"); lde2
-    (-%at('diff(y(t),t,1),t=0))+s^2*'laplace(y(t),t,s)+2*'laplace(y(t),t,s)-2*'laplace(x(t),t,s)-y(0)*s
+    (-%at('diff(y(t),t,1),t = 0))+s^2*'laplace(y(t),t,s) +2*'laplace(y(t),t,s)-2*'laplace(x(t),t,s) -y(0)*s
 
 che significa
 

src/sage/symbolic/assumptions.py

@@ -35,7 +35,10 @@
 Here is the list of acceptable features::
 
     sage: ", ".join(map(str, maxima("features")._sage_()))
-    'integer, noninteger, even, odd, rational, irrational, real, imaginary, complex, analytic, increasing, decreasing, oddfun, evenfun, posfun, constant, commutative, lassociative, rassociative, symmetric, antisymmetric, integervalued'
+    'integer, noninteger, even, odd, rational, irrational, real, imaginary,
+    complex, analytic, increasing, decreasing, oddfun, evenfun, posfun,
+    constant, commutative, lassociative, rassociative, symmetric,
+    antisymmetric, integervalued'
 
 Set positive domain using a relation::
 
@@ -149,8 +152,10 @@ def __init__(self, var, assumption):
         Here is the list of acceptable features::
 
             sage: ", ".join(map(str, maxima("features")._sage_()))
-            'integer, noninteger, even, odd, rational, irrational, real, imaginary, complex, analytic, increasing, decreasing, oddfun, evenfun, posfun, constant, commutative, lassociative, rassociative, symmetric, antisymmetric, integervalued'
-
+            'integer, noninteger, even, odd, rational, irrational, real,
+            imaginary, complex, analytic, increasing, decreasing, oddfun,
+            evenfun, posfun, constant, commutative, lassociative, rassociative,
+            symmetric, antisymmetric, integervalued'
         """
         self._var = var
         self._assumption = assumption