Add missing qldoc

Author: alexrford

javascript/ql/lib/semmle/javascript/security/CryptoAlgorithms.qll

@@ -82,6 +82,7 @@ class EncryptionAlgorithm extends MkEncryptionAlgorithm, CryptographicAlgorithm
 
   override predicate isWeak() { isWeak = true }
 
+  /** Holds if this algorithm is a stream cipher. */
   predicate isStreamCipher() { isStreamCipher(name) }
 }
 

python/ql/lib/semmle/python/concepts/CryptoAlgorithms.qll

@@ -82,6 +82,7 @@ class EncryptionAlgorithm extends MkEncryptionAlgorithm, CryptographicAlgorithm
 
   override predicate isWeak() { isWeak = true }
 
+  /** Holds if this algorithm is a stream cipher. */
   predicate isStreamCipher() { isStreamCipher(name) }
 }
 

ruby/ql/lib/codeql/ruby/security/CryptoAlgorithms.qll

@@ -82,6 +82,7 @@ class EncryptionAlgorithm extends MkEncryptionAlgorithm, CryptographicAlgorithm
 
   override predicate isWeak() { isWeak = true }
 
+  /** Holds if this algorithm is a stream cipher. */
   predicate isStreamCipher() { isStreamCipher(name) }
 }