man: Document Testsuite-Triggers in dsc(5)

debian/changelog

@@ -1,5 +1,9 @@
 dpkg (1.18.10) UNRELEASED; urgency=medium
 
+  [ Guillem Jover ]
+  * Documentation:
+    - Document Testsuite-Triggers in dsc(5).
+
   [ Updated scripts translations ]
   * German (Helge Kreutzmann).
 

man/dsc.5

@@ -142,6 +142,13 @@ If the \fBautopkgtest\fP value is present, a \fIdebian/tests/control\fP is
 expected to be present, if the file is present but not the value, then
 \fBdpkg\-source\fP will automatically add it, preserving previous values.
 .TP
+.BI Testsuite\-Triggers: " package-list"
+This field declares the comma-separated union of all test dependencies
+(\fBDepends\fP fields in \fIdebian/tests/control\fP file), with all
+restrictions removed, and OR dependencies flattened, except for binaries
+generated by this source package and meta-dependencies such as \fB@\fP or
+\fB@builddeps@\fP.
+.TP
 .BI Build\-Depends: " package-list"
 .TQ
 .BI Build\-Depends\-Arch: " package-list"