Fix typo

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=172328148

library/core/src/main/java/com/google/android/exoplayer2/text/cea/Cea608Decoder.java

@@ -350,7 +350,7 @@ public final class Cea608Decoder extends CeaDecoder {
         repeatableControlSet = false;
         return true;
       } else {
-        // This is a repeatable command, but we haven't see it yet, so set the repeabable control
+        // This is a repeatable command, but we haven't see it yet, so set the repeatable control
         // flag (to ensure we ignore the next one should it be a duplicate) and continue processing
         // the command.
         repeatableControlSet = true;