Fix two comments

One out-of-date and the other with a typo.

internal/contentenc/content.go

@@ -76,7 +76,6 @@ func (be *ContentEnc) CipherBS() uint64 {
 }
 
 // DecryptBlocks decrypts a number of blocks
-// TODO refactor to three-param for
 func (be *ContentEnc) DecryptBlocks(ciphertext []byte, firstBlockNo uint64, fileID []byte) ([]byte, error) {
 	cBuf := bytes.NewBuffer(ciphertext)
 	var err error

tests/canonical-benchmarks.bash

@@ -24,7 +24,7 @@ cd "$1"
 # Execute command, discard all stdout output, print elapsed time
 # (to stderr, unfortunately).
 function etime {
-	# Make the bash builtin "time" print out only the elapse wall clock
+	# Make the bash builtin "time" print out only the elapsed wall clock
 	# seconds
 	TIMEFORMAT=%R
 	time "$@" > /dev/null