CAMEL-21540: Include dsl/src/main/docs in gulpfile source pattern

The dsl.adoc lives at dsl/src/main/docs/ (depth 0), which is not
matched by {*,*/*}. Add explicit pattern for it.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: gnodet

docs/gulpfile.js

@@ -206,6 +206,7 @@ const sources = {
         '../core/camel-base/src/main/docs/!(*-component|*-language|*-dataformat|*-summary).adoc',
         '../core/camel-main/src/main/docs/!(*-component|*-language|*-dataformat|*-summary).adoc',
         '../components/{*,*/*}/src/main/docs/!(*-component|*-language|*-dataformat|*-summary).adoc',
+        '../dsl/src/main/docs/!(*-component|*-language|*-dataformat|*-summary).adoc',
         '../dsl/{*,*/*}/src/main/docs/!(*-component|*-language|*-dataformat|*-summary).adoc',
       ],
       destination: 'components/modules/others/pages',