fix docs

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@268541 91177308-0d34-0410-b5e6-96231b3b80d8

docs/UsersManual.rst

@@ -985,6 +985,7 @@ are listed below.
    program.
 
 **-f[no-]sanitize-recover=check1,check2,...**
+
 **-f[no-]sanitize-recover=all**
 
    Controls which checks enabled by ``-fsanitize=`` flag are non-fatal.