Squashed 'doc/' changes from e30aa466..36acf3ff

36acf3ff updated RELEASE.TXT

git-subtree-dir: doc
git-subtree-split: 36acf3ff50e03e7985f71c24eb196e8f43e875c7

RELEASE.TXT

@@ -1,4 +1,17 @@
 Version @PHREEQC_VER@: @PHREEQC_DATE@
+  	-----------------
+	April 15, 2024
+  	-----------------
+	PHREEQC: Fixed a memory error with iso.dat because it uses H3O+ instead of 
+	H+. The SC variable was uninitialized in that situation.
+
+	DATABASES: Amm.dat, phreeqc.dat, and pitzer.dat were updated with 
+	revisions to viscosity and specific conductance.
+
+	PhreeqcRM and IPhreeqc: Fixed bug with the temperature grid for llnl. Some 
+	internal testing and list generators used the default temperature of 25C, 
+	which caused an error if the temperature grid did not span 25C.
+
   	-----------------
 	March 25, 2024
   	-----------------