tbl: add page (#6594)

pages/common/tbl.md

@@ -0,0 +1,24 @@
+# tbl
+
+> Format tables for `troff`.
+> More information: <https://manned.org/tbl>.
+
+- Format tables for `troff` and print it to stdout:
+
+`cat {{path/to/file.troff}} | tbl`
+
+- Format tables for `troff` in "compatibility mode":
+
+`cat {{path/to/file.troff}} | tbl -C`
+
+- Format tables for `troff` from a file:
+
+`tbl {{path/to/file.troff}}`
+
+- Mark the beginning of a table ("Table Start"):
+
+`.TS`
+
+- Mark the end of the table ("Table End"):
+
+`.TE`