Use line when the documentation needs one source line instead of a whole
fragment or range.
The line attribute uses the same glob-style pattern syntax as start and end.
By default, embed-code behaves as if * exists at the beginning and end
of the pattern, so Hello can match any source line that contains Hello.
Use ^ or $ when the match must start or end at a line boundary.
Only the first matching source line is rendered into the fence. A line pattern
cannot be combined with fragment, start, or end.
The instruction below searches
Greeting.java
and renders the first line that contains Hello.
return "Hello, " + name + "!";