Changes 'matcher' to 'property' in examples (#2499)

Signed-off-by: kagarmoe <kgarmoe@chef.io>

docs/resources/bash.md.erb

@@ -14,7 +14,7 @@ A `command` resource block declares a command to be run, one (or more) expected
 
     describe bash('command') do
       it { should exist }
-      its('matcher') { should eq 'output' }
+      its('property') { should eq 'output' }
     end
 
 where

docs/resources/command.md.erb

@@ -14,7 +14,7 @@ A `command` resource block declares a command to be run, one (or more) expected
 
     describe command('command') do
       it { should exist }
-      its('matcher') { should eq 'output' }
+      its('property') { should eq 'output' }
     end
 
 where

docs/resources/etc_group.md.erb

@@ -13,7 +13,7 @@ Use the `etc_group` InSpec audit resource to test groups that are defined on Lin
 A `etc_group` resource block declares a collection of properties to be tested:
 
     describe etc_group('path') do
-      its('matcher') { should eq 'some_value' }
+      its('property') { should eq 'some_value' }
     end
 
 or:

docs/resources/os_env.md.erb

@@ -13,7 +13,7 @@ Use the `os_env` InSpec audit resource to test the environment variables for the
 A `os_env` resource block declares an environment variable, and then declares its value:
 
     describe os_env('VARIABLE') do
-      its('matcher') { should eq 1 }
+      its('property') { should eq 1 }
     end
 
 where

docs/resources/powershell.md.erb

@@ -17,7 +17,7 @@ A `powershell` resource block declares a Powershell script to be tested, and the
     EOH
 
     describe powershell(script) do
-      its('matcher') { should eq 'output' }
+      its('property') { should eq 'output' }
     end
 
 where