addr2line: add page (#4761)

pages/linux/addr2line.md

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+# addr2line
+
+> Convert addresses of a binary into file names and line numbers.
+
+- Display the filename and line number of the source code from an instruction address of an executable:
+
+`addr2line --exe={{path/to/executable}} {{address}}`
+
+- Display the function name, filename and line number:
+
+`addr2line --exe={{path/to/executable}} --functions {{address}}`
+
+- Demangle the function name for C++ code:
+
+`addr2line --exe={{path/to/executable}} --functions --demangle {{address}}`