[basic.def.odr] Fix example to perform the lvalue-to-rvalue conversion
outside the conditional expression, as intended.
[lib.complex.member.ops] fix operator declarations

In 26.4.2 (class definition), four arithmetic operators which take a complex argument are declared as member templates.
Merge pull request #298 from kariya-mitsuru/lib.complex.member.ops

[lib.complex.member.ops] fix operator declarations
[atomics.types.operations.req] Remove mention of atomic_address.
Fix missing space before bulleted lists.
[gram] Fix formatting of 'class' and 'enumeration' -- these don't refer
to keywords, so they shouldn't be in teletype font.
[temp.mem.enum] Add a paragraph break to remove unwanted whitespace at
the start of an example.
Remove indentation after line breaks within the same paragraph.