[IMP] Add and improve existing field tooltips in accounting module.

Respected Sir,
I have added and improved existing " field tooltips " in accounting module....
 modified:   addons/account/account.py
	modified:   addons/account/partner.py
	modified:   addons/account/res_config.py
	modified:   addons/account/wizard/account_financial_report.py
	modified:   addons/account/wizard/account_report_common.py
	modified:   addons/account_asset/account_asset.py
	modified:   addons/account_voucher/account_voucher.py
	modified:   addons/l10n_be_coda/wizard/account_coda_import.py
	modified:   addons/l10n_br/account.py