Control flow docs incorrect example (I assume a double "class" typo)

[credmond]

The control flow docs read:

• -obfuscate-control-flow class class com.password4j.Argon2Function { *; }
• -obfuscate-control-flow class class com.dprotect.** { *; }

But, I believe it should read:

• -obfuscate-control-flow class com.password4j.Argon2Function { *; }
• -obfuscate-control-flow class com.dprotect.** { *; }