Fix comparison comment in comment in snowflake algorithms

In the snowflake algorithms, there is the following comment:

// terminationConditions[i].alphaConfidence < terminationConditions[i+1].alphaConfidence
// terminationConditions[i].beta <= terminationConditions[i+1].beta

However, the two lines contradict, as if alpha confidence grows with i, then beta should decrease and not increase.
The reason is that the higher our confidence, the less consecutive polls we need to finalize.

Signed-off-by: Yacov Manevich <yacov.manevich@avalabs.org>

snow/consensus/snowball/binary_snowflake.go

@@ -20,7 +20,7 @@ func newBinarySnowflake(alphaPreference int, terminationConditions []termination
 // Invariant:
 // len(terminationConditions) == len(confidence)
 // terminationConditions[i].alphaConfidence < terminationConditions[i+1].alphaConfidence
-// terminationConditions[i].beta <= terminationConditions[i+1].beta
+// terminationConditions[i].beta >= terminationConditions[i+1].beta
 // confidence[i] >= confidence[i+1] (except after finalizing due to early termination)
 type binarySnowflake struct {
 	// wrap the binary slush logic

snow/consensus/snowball/nnary_snowflake.go

@@ -25,7 +25,7 @@ func newNnarySnowflake(alphaPreference int, terminationConditions []terminationC
 // Invariant:
 // len(terminationConditions) == len(confidence)
 // terminationConditions[i].alphaConfidence < terminationConditions[i+1].alphaConfidence
-// terminationConditions[i].beta <= terminationConditions[i+1].beta
+// terminationConditions[i].beta >= terminationConditions[i+1].beta
 // confidence[i] >= confidence[i+1] (except after finalizing due to early termination)
 type nnarySnowflake struct {
 	// wrap the n-nary slush logic

snow/consensus/snowball/unary_snowflake.go

@@ -22,7 +22,7 @@ func newUnarySnowflake(alphaPreference int, terminationConditions []terminationC
 // Invariant:
 // len(terminationConditions) == len(confidence)
 // terminationConditions[i].alphaConfidence < terminationConditions[i+1].alphaConfidence
-// terminationConditions[i].beta <= terminationConditions[i+1].beta
+// terminationConditions[i].beta >= terminationConditions[i+1].beta
 // confidence[i] >= confidence[i+1] (except after finalizing due to early termination)
 type unarySnowflake struct {
 	// alphaPreference is the threshold required to update the preference