Fix *.from_file examples opening a file then not using it (#913)

Fixes #851

Author: Strilanc

doc/python_api_reference_vDev.md

@@ -1962,7 +1962,7 @@ def from_file(
         ...     with open(path, 'w') as f:
         ...         print('CNOT 4 5', file=f)
         ...     with open(path) as f:
-        ...         circuit = stim.Circuit.from_file(path)
+        ...         circuit = stim.Circuit.from_file(f)
         >>> circuit
         stim.Circuit('''
             CX 4 5
@@ -7292,7 +7292,7 @@ def from_file(
         ...     with open(path, 'w') as f:
         ...         print('error(0.25) D2 D3', file=f)
         ...     with open(path) as f:
-        ...         circuit = stim.DetectorErrorModel.from_file(path)
+        ...         circuit = stim.DetectorErrorModel.from_file(f)
         >>> circuit
         stim.DetectorErrorModel('''
             error(0.25) D2 D3

doc/stim.pyi

@@ -1350,7 +1350,7 @@ class Circuit:
             ...     with open(path, 'w') as f:
             ...         print('CNOT 4 5', file=f)
             ...     with open(path) as f:
-            ...         circuit = stim.Circuit.from_file(path)
+            ...         circuit = stim.Circuit.from_file(f)
             >>> circuit
             stim.Circuit('''
                 CX 4 5
@@ -5714,7 +5714,7 @@ class DetectorErrorModel:
             ...     with open(path, 'w') as f:
             ...         print('error(0.25) D2 D3', file=f)
             ...     with open(path) as f:
-            ...         circuit = stim.DetectorErrorModel.from_file(path)
+            ...         circuit = stim.DetectorErrorModel.from_file(f)
             >>> circuit
             stim.DetectorErrorModel('''
                 error(0.25) D2 D3

glue/python/src/stim/__init__.pyi

@@ -1350,7 +1350,7 @@ class Circuit:
             ...     with open(path, 'w') as f:
             ...         print('CNOT 4 5', file=f)
             ...     with open(path) as f:
-            ...         circuit = stim.Circuit.from_file(path)
+            ...         circuit = stim.Circuit.from_file(f)
             >>> circuit
             stim.Circuit('''
                 CX 4 5
@@ -5714,7 +5714,7 @@ class DetectorErrorModel:
             ...     with open(path, 'w') as f:
             ...         print('error(0.25) D2 D3', file=f)
             ...     with open(path) as f:
-            ...         circuit = stim.DetectorErrorModel.from_file(path)
+            ...         circuit = stim.DetectorErrorModel.from_file(f)
             >>> circuit
             stim.DetectorErrorModel('''
                 error(0.25) D2 D3

src/stim/circuit/circuit.pybind.cc

@@ -1406,7 +1406,7 @@ void stim_pybind::pybind_circuit_methods(pybind11::module &, pybind11::class_<Ci
                 ...     with open(path, 'w') as f:
                 ...         print('CNOT 4 5', file=f)
                 ...     with open(path) as f:
-                ...         circuit = stim.Circuit.from_file(path)
+                ...         circuit = stim.Circuit.from_file(f)
                 >>> circuit
                 stim.Circuit('''
                     CX 4 5

src/stim/dem/detector_error_model.pybind.cc

@@ -930,7 +930,7 @@ void stim_pybind::pybind_detector_error_model_methods(
                 ...     with open(path, 'w') as f:
                 ...         print('error(0.25) D2 D3', file=f)
                 ...     with open(path) as f:
-                ...         circuit = stim.DetectorErrorModel.from_file(path)
+                ...         circuit = stim.DetectorErrorModel.from_file(f)
                 >>> circuit
                 stim.DetectorErrorModel('''
                     error(0.25) D2 D3