Improve docs generation for cli.Authors

This allows specifying multiple authors, whereas no available authors
will be formatted correctly now.

Signed-off-by: Sascha Grunert <sgrunert@suse.com>

testdata/expected-doc-full.man

@@ -1,7 +1,10 @@
 .nh
-.TH greet(8) 
+.TH greet(8)
 
-.SH Harrison
+.SH Harrison harrison@lolwut.com
+\[la]mailto:harrison@lolwut.com\[ra]
+Oliver Allen oliver@toyshop.com
+\[la]mailto:oliver@toyshop.com\[ra]
 
 .SH NAME
 .PP

testdata/expected-doc-full.md

@@ -1,6 +1,7 @@
-% greet(8) 
+% greet(8)
 
-% Harrison
+% Harrison <harrison@lolwut.com>
+% Oliver Allen <oliver@toyshop.com>
 
 # NAME
 

testdata/expected-doc-no-authors.md

@@ -0,0 +1,61 @@
+% greet(8)
+
+
+# NAME
+
+greet - Some app
+
+# SYNOPSIS
+
+greet
+
+```
+[--another-flag|-b]
+[--flag|--fl|-f]=[value]
+[--socket|-s]=[value]
+```
+
+# DESCRIPTION
+
+app [first_arg] [second_arg]
+
+**Usage**:
+
+```
+greet [GLOBAL OPTIONS] command [COMMAND OPTIONS] [ARGUMENTS...]
+```
+
+# GLOBAL OPTIONS
+
+**--another-flag, -b**: another usage text
+
+**--flag, --fl, -f**="": 
+
+**--socket, -s**="": some 'usage' text (default: value)
+
+
+# COMMANDS
+
+## config, c
+
+another usage test
+
+**--another-flag, -b**: another usage text
+
+**--flag, --fl, -f**="": 
+
+### sub-config, s, ss
+
+another usage test
+
+**--sub-command-flag, -s**: some usage text
+
+**--sub-flag, --sub-fl, -s**="": 
+
+## info, i, in
+
+retrieve generic information
+
+## some-command
+
+

testdata/expected-doc-no-commands.md

@@ -1,6 +1,7 @@
-% greet(8) 
+% greet(8)
 
-% Harrison
+% Harrison <harrison@lolwut.com>
+% Oliver Allen <oliver@toyshop.com>
 
 # NAME
 

testdata/expected-doc-no-flags.md

@@ -1,6 +1,7 @@
-% greet(8) 
+% greet(8)
 
-% Harrison
+% Harrison <harrison@lolwut.com>
+% Oliver Allen <oliver@toyshop.com>
 
 # NAME