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bundle: fix update example, add patch-update, group-update, and outdated examples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/common/gem.md

@@ -3,10 +3,6 @@
 > Interact with the package manager for the Ruby programming language.
 > More information: <https://rubygems.org>.
 
-- Search for remote gem(s):
-
-`gem search {{regexp}}`
-
 - Search for remote gem(s) and show all available versions:
 
 `gem search {{regexp}} --all`
@@ -19,6 +15,10 @@
 
 `gem install {{gemname}} --version {{1.0.0}}`
 
+- Install the latest matching (SemVer) version of a gem:
+
+`gem install {{gemname}} --version '~> {{1.0}}'`
+
 - Update a gem:
 
 `gem update {{gemname}}`