Update pns/modules/powershell/nav.adoc,...

Update pns/modules/powershell/nav.adoc, pns/modules/powershell/pages/pe_find_cmdlets.adoc, pns/modules/powershell/pages/pe_create_functions.adoc, pns/modules/powershell/pages/pe_function_parameters.adoc, pns/modules/powershell/pages/pe_advanced_functions.adoc, pns/modules/powershell/pages/pe_regex.adoc, pns/modules/powershell/pages/pe_running_cmdlets.adoc, pns/modules/powershell/pages/pe_variables.adoc, pns/modules/powershell/pages/pe_reverse_arrays.adoc, pns/modules/powershell/pages/pe_arrays_hash_tables.adoc, pns/modules/powershell/pages/pe_the_pipeline.adoc, pns/modules/powershell/pages/pe_custom_object.adoc, pns/modules/powershell/pages/pe_comparison_and_condition.adoc, pns/modules/powershell/pages/pe_looping_&_iteration.adoc

Closes #13 (closed)