[strings] Consistently spell return types #8107
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For
basic_string::front
/basic_string::back
, the return types are modified to(const_)reference
for the consistency with other sequence containers.For
basic_string_view::data
, the return types is modified toconst charT*
for the consistency withbasic_string
. The same change applies to spelling of the type of closely related exposition-only data memberdata_
.