getfattr, setfattr, sysdig: add page (#13921)

* sysdig

* Add periods and colons

* Modified with recommended changes

* Fix typo

* Attribute

* Made fixes

* Removed spaces

* Newline

* Design changes

* Corrected link and attribute name

---------

Co-authored-by: Wiktor Perskawiec <git@spageektti.cc>

pages/linux/getfattr.md

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+# getfattr
+
+> Display file names and extended attributes.
+> More information: <https://manned.org/getfattr>.
+
+- Retrieve all extended attributes of a file and display them in a detailed format:
+
+`getfattr -d {{path/to/file}}`
+
+- Get a specific attribute of a file:
+
+`getfattr -n user.{{attribute_name}} {{path/to/file}}`

pages/linux/setfattr.md

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+# setfattr
+
+> Set extended file attributes.
+> More information: <https://manned.org/setfattr>.
+
+- Set name of attribute for file:
+
+`setfattr -n user.{{attribute_name}} {{path/to/file}}`
+
+- Set a user-defined value of an extended attribute on a file:
+
+`setfattr -n user.{{attribute_name}} -v "{{value}}" {{path/to/file}}`
+
+- Remove a specific attribute of a file:
+
+`setfattr -x user.{{attribute_name}} {{path/to/file}}`

pages/linux/sysdig.md

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+# sysdig
+
+> System troubleshooting, analysis and exploration.
+> Capture, filter and store systemcalls.
+> More information: <https://github.com/draios/sysdig/wiki>.
+
+- Capture all the events from the live system and print them to screen:
+
+`sysdig`
+
+- Capture all the events from the live system and save them to disk:
+
+`sysdig -w {{path/to/file}}.scap`
+
+- Read events from a file and print them to screen:
+
+`sysdig -r {{path/to/file}}.scap`
+
+- Filter and Print all the open system calls invoked by cat:
+
+`sysdig proc.name=cat and evt.type=open`
+
+- Register any found plugin and use dummy as input source passing to it open params:
+
+`sysdig -I dummy:'{{parameter}}'`
+
+- List the available chisels:
+
+`sysdig -cl`
+
+- Use the spy_ip chisel to look at the data exchanged with ip address:
+
+`sysdig -c spy_ip {{ip_address}}`