Update constr regex example to include start and end lines (#1400)

This is due to the regex using `re.match()` which allows for only a partial match, fix #1396
pydantic · Apr 18, 2020 · 161a12a · 161a12a
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diff --git a/changes/1396-lmcnearney.md b/changes/1396-lmcnearney.md
@@ -0,0 +1 @@
+Update constr regex example to include start and end lines
diff --git a/docs/examples/types_constrained.py b/docs/examples/types_constrained.py
@@ -20,7 +20,7 @@ class Model(BaseModel):
     strip_bytes: conbytes(strip_whitespace=True)
 
     short_str: constr(min_length=2, max_length=10)
-    regex_str: constr(regex='apple (pie|tart|sandwich)')
+    regex_str: constr(regex='^apple (pie|tart|sandwich)$')
     strip_str: constr(strip_whitespace=True)
 
     big_int: conint(gt=1000, lt=1024)