erase: add page (#17601)

* Create erase.md

Author: Managor

pages/cisco-ios/erase.md

@@ -0,0 +1,12 @@
+# erase
+
+> Delete preset things.
+> More information: <https://www.cisco.com/c/en/us/td/docs/ios/ios_xe/fundamentals/configuration/guide/2_xe/cf_xe_book/cf_config-files_xe.html>.
+
+- Erase the startup configuration:
+
+`erase startup-config`
+
+- Erase a filesystem:
+
+`erase {{flash}}:`