A inline is a special kind of command.
They are param, tparam and base and used to document (template) parameters and base classes,
because you cannot put a corresponding comment there.
As such they are shorthands for the \entity unique-name command.
They are followed by the name of entity they refer to.
The inline and argument is stripped from the text.
The rest of the line will be treated as brief documentation.
Like a section, an inline ends when a new special command or hard line break is encountered or a paragraph ends.
You can include sections in inlines, however.
For example:
/// Normal documentation for the function.
///
/// \param foo Brief documentation for the parameter `foo`.
/// It continues here with details.
/// \param bar
/// \exclude
///
/// The `\exclude` is part of the documentation for `bar`.
void func(int foo, int bar);