Remove workaround for ancient HTML generation code.

Remove trailing whitespace.

Rephrase the NOTE about embedded NUL characters, using "apparent length"
for what strlen(3) reports, and "true length" for what the return value
reports.

mention what happens if the line contains NUL's.

fix markup.

Fix documentation to reflect what happens when EOF is found before delimiter,
aligning us with POSIX.

- Put empty line after the local variable definition in the sample code
to improve readability.
- Remove indirection operator to clarify error condition.

Use .Fn instead of .Fa for functions. Also rearrange slightly.

Fix markup.

Make HTML-ready, use standard section headers, fix Xr.

Note that callers should use feof(3) or ferror(3) to distinguish between
EOF or an error.

Note that EOF returns -1 when no characters are read.
Add code example.

Note some restrictions for getdelim arguments noted by joerg.
Bump date.

The character is NUL, the pointer is NULL.
Fix a typo.
It's \-1, not -1.
Add "and getline" in a few places.
Add comma in enumeration.
No dot needed in SEE ALSO.
End sentence with a dot.

Add implementations for getdelim(3) and getline(3).