Spelling fixes (#2902)

diff --git a/Lib/test/test_subprocess.py b/Lib/test/test_subprocess.py
index a99976a..d152826 100644
--- a/Lib/test/test_subprocess.py
+++ b/Lib/test/test_subprocess.py
@@ -668,25 +668,25 @@
             subprocess.Popen([sys.executable, "-c", "pass#\0"])
 
     def test_invalid_env(self):
-        # null character in the enviroment variable name
+        # null character in the environment variable name
         newenv = os.environ.copy()
         newenv["FRUIT\0VEGETABLE"] = "cabbage"
         with self.assertRaises(ValueError):
             subprocess.Popen([sys.executable, "-c", "pass"], env=newenv)
 
-        # null character in the enviroment variable value
+        # null character in the environment variable value
         newenv = os.environ.copy()
         newenv["FRUIT"] = "orange\0VEGETABLE=cabbage"
         with self.assertRaises(ValueError):
             subprocess.Popen([sys.executable, "-c", "pass"], env=newenv)
 
-        # equal character in the enviroment variable name
+        # equal character in the environment variable name
         newenv = os.environ.copy()
         newenv["FRUIT=ORANGE"] = "lemon"
         with self.assertRaises(ValueError):
             subprocess.Popen([sys.executable, "-c", "pass"], env=newenv)
 
-        # equal character in the enviroment variable value
+        # equal character in the environment variable value
         newenv = os.environ.copy()
         newenv["FRUIT"] = "orange=lemon"
         with subprocess.Popen([sys.executable, "-c",