Update cheatsheets

jhat

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# jhat
+
+> Java heap analysis tool.
+> More information: <https://docs.oracle.com/javase/8/docs/technotes/tools/unix/jhat.html>.
+
+- Analyze a heap dump (from `jmap`), view via HTTP on port 7000:
+
+`jhat {{dump_file.bin}}`
+
+- Analyze a heap dump, specifying an alternate port for the http server:
+
+`jhat -p {{port}} {{dump_file.bin}}`
+
+- Analyze a dump letting `jhat` use up to 8 GB RAM (2-4x dump size recommended):
+
+`jhat -J-mx8G {{dump_file.bin}}`