CMP0059: Fix typo in policy description

Help/policy/CMP0059.rst

 CMP0059
 -------
 
-Don't treat ``DEFINITIONS`` as a built-in directory property.
+Do not treat ``DEFINITIONS`` as a built-in directory property.
 
 CMake 3.3 and above no longer make a list of definitions available through
 the :prop_dir:`DEFINITIONS` directory property.  The

Source/cmPolicies.h

@@ -204,7 +204,7 @@ class cmPolicy;
     "Ninja requires custom command byproducts to be explicit.", \
     3, 3, 0, cmPolicies::WARN) \
   SELECT(POLICY, CMP0059, \
-    "Do no treat DEFINITIONS as a built-in directory property.", \
+    "Do not treat DEFINITIONS as a built-in directory property.", \
     3, 3, 0, cmPolicies::WARN) \
   SELECT(POLICY, CMP0060, \
     "Link libraries by full path even in implicit directories.", \

Tests/RunCMake/CMP0059/CMP0059-WARN-stderr.txt

 CMake Warning \(dev\) at CMP0059-WARN.cmake:6 \(get_property\):
-  Policy CMP0059 is not set: Do no treat DEFINITIONS as a built-in directory
+  Policy CMP0059 is not set: Do not treat DEFINITIONS as a built-in directory
   property.  Run "cmake --help-policy CMP0059" for policy details.  Use the
   cmake_policy command to set the policy and suppress this warning.
 Call Stack \(most recent call first\):
@@ -8,7 +8,7 @@ This warning is for project developers.  Use -Wno-dev to suppress it.
 
 DEFS: -DSOME_DEF
 CMake Warning \(dev\) at CMP0059-WARN.cmake:14 \(get_property\):
-  Policy CMP0059 is not set: Do no treat DEFINITIONS as a built-in directory
+  Policy CMP0059 is not set: Do not treat DEFINITIONS as a built-in directory
   property.  Run "cmake --help-policy CMP0059" for policy details.  Use the
   cmake_policy command to set the policy and suppress this warning.
 Call Stack \(most recent call first\):