sed.1: add some missing info - sbase - suckless unix tools
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       ---
 (DIR) commit 782afdf8c6202298a35f37bbe6eaedc5f63a7776
 (DIR) parent 20c27b1ad0f2fae65ede721c43f8cb66186d3049
 (HTM) Author: Andrea Calligaris <ac89.hk.public@gmail.com>
       Date:   Fri,  6 Dec 2024 10:37:37 +0100
       
       sed.1: add some missing info
       
       There are some features that are coded already, might as well document them.
       
       Diffstat:
         M sed.1                               |      22 ++++++++++++++++++++--
       
       1 file changed, 20 insertions(+), 2 deletions(-)
       ---
 (DIR) diff --git a/sed.1 b/sed.1
       @@ -50,16 +50,32 @@ Append the commands from
        to the list of editing commands.
        .El
        .Sh EXTENDED DESCRIPTION
       -Editing commands take the form
       +Editing commands take the form:
        .Pp
        [address[,address]]function
       +.Pp
       +Commands can be separated by ';' or by a new line.
       +.Pp
       +Multiple functions for the specified address (or address-range) can be enclosed
       +in blocks with '{' and '}':
       +.Pp
       +[address[,address]] { function ; function }
       +.Pp
        .Ss Addresses
        Addresses are either blank, a positive decimal integer denoting a line
        number, the character '$' denoting the last line of input, or a regular
       -expression.
       +expression (in the format
       +.No / Ns
       +.Ar regexp Ns /).
        A command with no addresses matches every line, one address matches
        individual lines, and two addresses matches a range of lines from the
        first to the second address inclusive.
       +.Pp
       +The character '!' may be appended after the addresses,
       +in which case the function is executed only if the addresses
       +.Em don't
       +match.
       +.Pp
        .Ss Functions
        .Bl -tag -width Ds
        .It Ar a Op Ar text
       @@ -152,6 +168,8 @@ Replace each occurrence of a character from set 1 with the corresponding
        character from set 2.
        .It Ar :label
        Create a label for b and t commands.
       +.It Ar #comment
       +The comment extends until the next newline.
        .It Ar =
        Write current input line number to output.
        .El