Finish renaming function tribits_write_package_client_export_files_in…

…stall_targets() (#582)

Don't know how this was allowed to merge given that the build of the docs was
broken by the renaming of
`tribits_write_package_client_export_files_install_targets()` to
`tribits_write_package_client_export_files_export_and_install_targets()`.

But this fixes that.

tribits/doc/guides/TribitsSystemMacroFunctionDocTemplate.rst

@@ -51,6 +51,6 @@ understand the internals of TriBITS.
 @MACRO:    tribits_save_off_dependency_vars() +
 @MACRO:    tribits_set_dep_packages() +
 @FUNCTION: tribits_trace_file_processing() +
-@FUNCTION: tribits_write_package_client_export_files_install_targets() +
+@FUNCTION: tribits_write_package_client_export_files_export_and_install_targets() +
 @MACRO:    tribits_write_xml_dependency_files() +
 @FUNCTION: tribits_write_xml_dependency_files_if_supported() +