[rubygems/rubygems] Bundler: update command example in bundle-exec(1)

Signed-off-by: Takuya Noguchi <takninnovationresearch@gmail.com>

https://github.com/rubygems/rubygems/commit/28bf5c8b33

lib/bundler/man/bundle-exec.1

@@ -155,7 +155,7 @@ You can find a list of all the gems containing gem plugins by running
 .
 .nf
 
-ruby \-rrubygems \-e "puts Gem\.find_files(\'rubygems_plugin\.rb\')"
+ruby \-e "puts Gem\.find_files(\'rubygems_plugin\.rb\')"
 .
 .fi
 .

lib/bundler/man/bundle-exec.1.ronn

@@ -145,7 +145,7 @@ their plugins.
 You can find a list of all the gems containing gem plugins
 by running
 
-    ruby -rrubygems -e "puts Gem.find_files('rubygems_plugin.rb')"
+    ruby -e "puts Gem.find_files('rubygems_plugin.rb')"
 
 At the very least, you should remove all but the newest
 version of each gem plugin, and also remove all gem plugins