Docs: Rephrase in about section (#8609)

Under Philosophy section, Every rule subsection
eslint · May 16, 2017 · 1149378 · 1149378
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diff --git a/docs/about/index.md b/docs/about/index.md
@@ -23,8 +23,8 @@ Everything is pluggable:
 Every rule:
 
 * Is standalone
-* Can be able to be turned off or on (nothing can be deemed "too important to turn off")
-* Can be set to be a warning or error individually
+* Can be turned off or on (nothing can be deemed "too important to turn off")
+* Can be set to a warning or error individually
 
 Additionally: