Argument content is converted to an Rd piece using
name to determine the format of the result.
The Rd tag of content is set as appropriate for name.
More specifically, if name is the name of a macro (without the
leading `\') whose content has a known "Rdtag", that tag is
used. Otherwise the tag is set to "TEXT".
If force.sec is TRUE, name is treated as the name of a
top level section of an Rd object. A top level section is exported as
one argument macro if it is a standard section (detected with
is_Rdsecname) and as the two argument macro
"\section" otherwise.
If force.sec is FALSE, the content is exported as one argument
macro without further checks.