在DocBlocks中，写一行时我应该总是使用单行符号吗？

Let's say I have one line of summary, must I right it like that:

/** summary */

or can I write it like this:

/**
 * summary
 */

I prefer the second option, but is that required to use the first option?

According to the documentation, "DocComments may be a single line in size but may also span multiple lines" (emphasis mine.)

So, you can do it either way.