gnucash-docs: New annotated tag '5.13'

[John Ralls]

        at  https://github.com/Gnucash/gnucash-docs/tree/2fea1c1d25313f34c071d6d927e9b6656e88027d (tag)
   tagging  40cc42d717128c9e210523dd9f79dd045b0fd907 (commit)
  replaces  5.12
 tagged by  John Ralls
        on  Sat Sep 27 21:03:34 2025 -0700


Release documentation for GnuCash 5.13

Christian Wehling (3):
      docbook: gnc-gui-*: Cleanup entities and improve accel
      de:manual:ch_Transactions: Rewrite section 'Import with AqB'
      de:manual:ch_Transactions: new description of import format

Christopher Lam (1):
      manual/ch_Reports: add Transaction Report Display/Invoice manual entry

John Ralls (5):
      Merge Christpher Lam's 'trep-invoice' into stable.
      Fix cmake variable name for build doc directory.
      DOCDIR_BUILD: We want PROJECT_NAME, not PACKAGE_NAME
      Merge Christian Wheling's 'docbook' into stable.
      Release documentation for GnuCash 5.13.