Update cheatsheets

tldr/x-ping

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# x ping
+
+> Enhanced modules for ping.
+> More information: <https://x-cmd.com/mod/ping>.
+
+- Ping a specific host (defaults to bing.com if omitted):
+
+`x ping {{host}}`
+
+- Show ping results as a heatmap:
+
+`x ping {{[-m|--heatmap]}} {{host}}`
+
+- Show ping results as a bar graph:
+
+`x ping {{[-b|--bar]}} {{host}}`
+
+- Process ping results and display as heatmap:
+
+`ping {{host}} | x ping vis {{[-m|--heatmap]}}`
+
+- Show help:
+
+`x ping {{[-h|--help]}}`