Update cheatsheets

graphml2gv

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# graphml2gv
+
+> Convert a graph from `graphml` to `gv` format.
+> Converters: `gml2gv`, `gv2gml`, `gv2gxl`, `gxl2gv`, `graphml2gv` & `mm2gv`.
+> More information: <https://graphviz.org/pdf/graphml2gv.1.pdf>.
+
+- Convert a graph from `gml` to `gv` format:
+
+`graphml2gv -o {{output.gv}} {{input.gml}}`
+
+- Convert a graph using `stdin` and `stdout`:
+
+`cat {{input.gml}} | graphml2gv > {{output.gv}}`
+
+- Display help:
+
+`graphml2gv -?`