man: Fix formatting in SOURCE_DATE_EPOCH description

debian/changelog

@@ -5,6 +5,7 @@ dpkg (1.18.11) UNRELEASED; urgency=medium
     - Update custom changelog parser API support status in README.api.
     - Fix typos in docs and man pages. Thanks to Jakub Wilk <jwilk@debian.org>
       Closes: #834584
+    - Fix formatting in SOURCE_DATE_EPOCH description in dpkg-deb(5).
   * Build system:
     - Add support for profiling perl modules.
     - Clean up compiler and linker automatic flag usage in configure.

man/dpkg-deb.1

@@ -307,8 +307,8 @@ temporary files and directories.
 .TP
 .B SOURCE_DATE_EPOCH
 If set, it will be used as the timestamp (as seconds since the epoch) in
-the \fBdeb\fP(5)'s \fBar\fB(5) container and used to clamp the mtime in
-the \fBtar\fB(5) file entries.
+the \fBdeb\fP(5)'s \fBar\fP(5) container and used to clamp the mtime in
+the \fBtar\fP(5) file entries.
 .
 .SH NOTES
 Do not attempt to use just