chore: fix some comments (#13843)

Signed-off-by: redistay <wujunjing@outlook.com>

beacon-chain/blockchain/head_sync_committee_info_test.go

@@ -61,7 +61,7 @@ func TestService_headNextSyncCommitteeIndices(t *testing.T) {
 	indices, err := c.headNextSyncCommitteeIndices(context.Background(), 0, primitives.Slot(slot))
 	require.NoError(t, err)
 
-	// NextSyncCommittee should be be empty after `ProcessSyncCommitteeUpdates`. Validator should get indices.
+	// NextSyncCommittee should be empty after `ProcessSyncCommitteeUpdates`. Validator should get indices.
 	require.NotEqual(t, 0, len(indices))
 }
 

beacon-chain/slasher/doc.go

@@ -135,7 +135,7 @@ With 1_048_576 validators, we need 4096 * 2MB = 8GB
 Storing both MIN and MAX spans for 1_048_576 validators takes 16GB.
 
 Each chunk is stored snappy-compressed in the database.
-If all validators attest ideally, a MIN SPAN chunk will contain only `2`s, and and MAX SPAN chunk will contain only `0`s.
+If all validators attest ideally, a MIN SPAN chunk will contain only `2`s, and MAX SPAN chunk will contain only `0`s.
 This will compress very well, and will let us store a lot of data in a small amount of space.
 */
 

beacon-chain/sync/initial-sync/blocks_fetcher.go

@@ -236,7 +236,7 @@ func (f *blocksFetcher) loop() {
 
 	// Main loop.
 	for {
-		// Make sure there is are available peers before processing requests.
+		// Make sure there are available peers before processing requests.
 		if _, err := f.waitForMinimumPeers(f.ctx); err != nil {
 			log.Error(err)
 		}