Used canned example for solverMLE(...,RealPrecision=>...)

This example has been known to cause division by zero errors when the
random seed changes.

M2/Macaulay2/packages/GraphicalModelsMLE.m2

@@ -1485,11 +1485,23 @@ doc ///
     Text
      This optional input only applies when the sample data or the sample covariance matrix has real entries.
      By default, the precision is 53 (the default precision for real numbers in M2).
-    Example
-     G = mixedGraph(digraph {{1,2},{1,3},{2,3},{3,4}},bigraph {{3,4}});
-     U = matrix{{6.2849049, 10.292875, 1.038475, 1.1845757}, {3.1938475, 3.2573, 1.13847, 1}, {4/5, 3/2, 9/8, 3/10}, {10/7, 2/3,1, 8/3}};
-     solverMLE(G,U,RealPrecision=>10)
+    CannedExample
+     i1 : G = mixedGraph(digraph {{1,2},{1,3},{2,3},{3,4}},bigraph {{3,4}});
+
+     i2 : U = matrix{{6.2849049, 10.292875, 1.038475, 1.1845757}, {3.1938475, 3.2573, 1.13847, 1}, {4/5, 3/2, 9/8, 3/10}, {10/7, 2/3,1, 8/3}};
+
+                     4         4
+     o2 : Matrix RR    <-- RR
+                   53        53
+
+     i3 : solverMLE(G,U,RealPrecision=>10)
+
+     o3 = (1.83311, | 4.52904   7.81123   -.0250185 .309951   |, 2)
+                    | 7.81123   14.3732   -.0382332 .473665   |
+                    | -.0250185 -.0382332 .00337164 -.0418254 |
+                    | .309951   .473665   -.0418254 .742627   |
 
+     o3 : Sequence
   SeeAlso
      scoreEquations
      solverMLE