doc: fix typos throughout docs and code

backend/seafile/seafile.go

@@ -528,7 +528,7 @@ func (f *Fs) NewObject(ctx context.Context, remote string) (fs.Object, error) {
 
 // Put in to the remote path with the modTime given of the given size
 //
-// When called from outside a Fs by rclone, src.Size() will always be >= 0.
+// When called from outside an Fs by rclone, src.Size() will always be >= 0.
 // But for unknown-sized objects (indicated by src.Size() == -1), Put should either
 // return an error or upload it properly (rather than e.g. calling panic).
 //