doc: fix typos in environment_variables.md

PR-URL: #59536
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>

Author: phistuck

doc/api/environment_variables.md

@@ -96,10 +96,10 @@ For example:
     MY_VAR_B   =    '   my variable b   '
 ```
 
-will be treaded identically to:
+will be treated identically to:
 
 ```text
-MY_VAR_A = my variable
+MY_VAR_A = my variable a
 MY_VAR_B = '   my variable b   '
 ```