Omit NAME section if blank description

Also, update man page for configuration to document that
if a blank description is entered, the "NAME" section is an
empty string.

Signed-off-by: Harumi Kuno <harumi.kuno@hpe.com>

doc/usage/configuration.rst

@@ -2331,6 +2331,8 @@ These options influence manual page output.
 
    *description*
      Description of the manual page.  This is used in the NAME section.
+     Can be an empty string if you do not want to automatically generate
+     the NAME section.
 
    *authors*
      A list of strings with authors, or a single string.  Can be an empty

sphinx/writers/manpage.py

@@ -112,10 +112,10 @@ def __init__(self, document: nodes.document, builder: Builder) -> None:
     # overwritten -- added quotes around all .TH arguments
     def header(self) -> str:
         tmpl = (".TH \"%(title_upper)s\" \"%(manual_section)s\""
-                " \"%(date)s\" \"%(version)s\" \"%(manual_group)s\"\n"
-                ".SH NAME\n")
+                " \"%(date)s\" \"%(version)s\" \"%(manual_group)s\"\n")
         if self._docinfo['subtitle']:
-            tmpl += "%(title)s \\- %(subtitle)s\n"
+            tmpl += (".SH NAME\n"
+                     "%(title)s \\- %(subtitle)s\n")
         return tmpl % self._docinfo
 
     def visit_start_of_file(self, node: Element) -> None: