mpstat: add page (#1301)

* mpstat: add page

* Update mpstat

- Incrementally added options
- Simplified the descriptions
- Tokenified the values

pages/linux/mpstat.md

@@ -0,0 +1,15 @@
+# mpstat
+
+> Report CPU statistics.
+
+- Display CPU statistics every 2 seconds:
+
+`mpstat {{2}}`
+
+- Display 5 reports, one by one, at 2 second intervals:
+
+`mpstat {{2}} {{5}}`
+
+- Display 5 reports, one by one, from a given processor, at 2 second intervals:
+
+`mpstat -P {{0}} {{2}} {{5}}`