Man pages matching name tcl_zlibdeflate in section 3tcl:

Tcl_ZlibDeflate.3tcl.en	debian 10 / tcl8.6-doc
Tcl_ZlibDeflate.3tcl.en	debian 11 / tcl8.6-doc
Tcl_ZlibDeflate.3tcl.en	debian 12 / tcl8.6-doc