fixup! go/zodb: Tweak documentation a bit so it renders more well in godoc

Missed few places in 8685b742.

go/zodb/cache_test.go

@@ -636,7 +636,7 @@ func (c *Checker) assertEq(a, b interface{}) {
 
 // ----------------------------------------
 
-// noopStorage is dummy StorLoader which for any oid/xid always returns 1-byte data
+// noopStorage is dummy StorLoader which for any oid/xid always returns 1-byte data.
 type noopStorage struct{}
 var noopData = []byte{0}
 
@@ -648,7 +648,7 @@ func (s *noopStorage) Load(_ context.Context, xid Xid) (buf *mem.Buf, serial Tid
 	return mkbuf(noopData), 1, nil
 }
 
-// benchLoad serially benchmarks a StorLoader - either storage directly or a cache on top of it
+// benchLoad serially benchmarks a StorLoader - either storage directly or a cache on top of it.
 //
 // oid accessed are [0, worksize)
 func benchLoad(b *testing.B, l StorLoader, worksize int) {

go/zodb/zodb.go

@@ -182,7 +182,7 @@ func (e *NoDataError) Error() string {
 	}
 }
 
-// OpError is the error returned by IStorageDriver operations
+// OpError is the error returned by IStorageDriver operations.
 type OpError struct {
 	URL  string	 // URL of the storage
 	Op   string	 // operation that failed
@@ -204,7 +204,7 @@ func (e *OpError) Cause() error {
 }
 
 
-// IStorage is the interface provided by opened ZODB storage
+// IStorage is the interface provided by opened ZODB storage.
 type IStorage interface {
 	IStorageDriver
 
@@ -219,7 +219,7 @@ type IStorage interface {
 	Prefetch(ctx context.Context, xid Xid)
 }
 
-// IStorageDriver is the raw interface provided by ZODB storage drivers
+// IStorageDriver is the raw interface provided by ZODB storage drivers.
 type IStorageDriver interface {
 	// URL returns URL of how the storage was opened
 	URL() string