split debug.txt into mdbook chapters

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+# pidstat(1)
+
+Trace minor/major page faults.
+```markdown
+pidstat -r -p <pid> [interval]
+  minor_pagefault: happens when the page needed is already in memory but not
+                   allocated to the faulting process, in that case the kernel
+                   only has to create a new page-table entry pointing to the
+                   shared physical page
+  major_pagefault: happends when the page needed is NOT in memory, the kernel
+                   has to create a new page-table entry and populate the
+                   physical page
+```