fixup! slapos.recipe.build.env.sh improvements/fixes

slapos/recipe/cmmi/README.rst

@@ -986,7 +986,7 @@ developer can try same build process as the recipe tried.
     Error: System error
     >>> import glob
     >>> cat(glob.glob(os.path.join(shared_dir, 'package/**__compile__/slapos.recipe.build.env.sh'))[0])
-    export FOO="bar"
+    export FOO=bar
     ...
 
 Next time buildout runs, it detects that the build failed, remove the compile dir and retry.