graphviz filter commands: add pages (#6401)

pages/common/sccmap.md

@@ -0,0 +1,17 @@
+# sccmap
+
+> Extract strongly connected components of directed graphs.
+> Graphviz filters: `acyclic`, `bcomps`, `comps`, `edgepaint`, `gvcolor`, `gvpack`, `mingle`, `nop`, `sccmap`, `tred`, & `unflatten`.
+> More information: <https://www.graphviz.org/pdf/sccmap.1.pdf>.
+
+- Extract strongly connected components of one or more directed graphs:
+
+`sccmap -S {{path/to/input1.gv}} {{path/to/input2.gv ...}} > {{path/to/output.gv}}`
+
+- Print statistics about a graph, producing no output graph:
+
+`sccmap -v -s {{path/to/input1.gv}} {{path/to/input2.gv ...}}`
+
+- Display help for `sccmap`:
+
+`sccmap -?`