auracle: add page, gem,bundle: update (#4572)

gem: add SemVer spec install example
bundle: fix update example, add patch-update, group-update, and outdated examples

pages/linux/auracle.md

@@ -0,0 +1,20 @@
+# auracle
+
+> Command line tool used to interact with Arch Linux's User Repository, commonly referred to as the AUR.
+> More information: <https://github.com/falconindy/auracle>.
+
+- Display AUR packages that match a regular expression:
+
+`auracle search '{{regex}}'`
+
+- Display package information for a space-separated list of AUR packages:
+
+`auracle info {{package1}} {{package2}}`
+
+- Display the `PKGBUILD` file (build information) for a space-separated list of AUR packages:
+
+`auracle show {{package1}} {{package2}}`
+
+- Display updates for installed AUR packages:
+
+`auracle outdated`