[basic.types] Add missing "be" in note (#1839)

stbergmann · tkoeppe · commit 63ccd0513f6d · 2017-11-25T02:33:31.000Z
diff --git a/source/basic.tex b/source/basic.tex
@@ -3751,7 +3751,7 @@
 within a constant expression.
 It is not a guarantee that it is possible to create such an object,
 nor is it a guarantee that any object of that type
-will usable in a constant expression.
+will be usable in a constant expression.
 \end{note}
 
 \pnum
