add release note

Author: wpbonelli

doc/ReleaseNotes/changes/inactive-cell-bc-warning.toml

@@ -0,0 +1,3 @@
+section = "fixes"
+subsection = "stress"
+description = "Placing a boundary condition in an inactive cell previously caused an error in most stress packages (WEL, DRN, RIV, CHD, GHB, FLW, CDB, ZDG, CNC, SRC, CTP, ESL). This has been changed to a warning, and the inactive boundary entry is silently ignored during the simulation. Packages that already skipped inactive cells (RCH, EVT, PCP, EVP) are unaffected."

doc/ReleaseNotes/develop.toml

@@ -123,3 +123,8 @@ description = "The Multi-Aquifer Well (MAW) Package now supports non-vertical (s
 section = "features"
 subsection = "stress"
 description = "Grid array-based input (READARRAYGRID) is now available for the CHD, WEL, DRN, RIV, and GHB stress packages.  Grid array-based input allows stress package data to be specified as full-grid arrays using the DNODATA value (3.0E+30) to identify inactive cells.  Auxiliary variable arrays persist across stress periods if not re-specified, and CONSTANT array input is supported for any array after the first in a period block."
+
+[[items]]
+section = "fixes"
+subsection = "stress"
+description = "Placing a boundary condition in an inactive cell previously caused an error in most stress packages (WEL, DRN, RIV, CHD, GHB, FLW, CDB, ZDG, CNC, SRC, CTP, ESL). This has been changed to a warning. Packages that already skipped inactive cells (RCH, EVT, PCP, EVP) are unaffected."