minor docs changes

Author: briantoby

GSASII/GSASIIctrlGUI.py

@@ -4961,7 +4961,7 @@ def AddSpinner(varSizer,label,SelCtrl,binding):
         parmSizer.Add(selectionsSizer,0)
         refChoices = ['All','Refined']
         txt = ('"R" indicates a refined variable\n'+
-               '"C" indicates generated from a user entered constraint')
+               '"C" value generated from a constraint')
         if fcount:
             refChoices += ['Frozen']
             txt += '\n"F" indicates a variable that is Frozen due to exceeding min/max'

docs/source/packages.rst

@@ -1,5 +1,5 @@
-GSAS-II Requirements, Python Packages and External Software
-==============================================================
+GSAS-II Execution Environment
+======================================================
 
 Supported Platforms
 --------------------------------
@@ -170,7 +170,8 @@ Far fewer packages are required to run GSAS-II on a
 compute server via the scripting interface
 and without a GUI.
 
-GUI Requirements
+----------------
+ GUI Requirements
 ----------------
 
 When using the GSAS-II graphical user interface (GUI), the following
@@ -275,7 +276,8 @@ Note that binaries for Python 3.12 and 3.13 using numpy 2.2 are also now supplie
 .. _ScriptingRequirements:
 
 
-Scripting Requirements
+-----------------------
+ Scripting Requirements
 -----------------------
 
 The GSAS-II scripting interface (:mod:`GSASIIscriptable`) will not
@@ -349,7 +351,8 @@ Notes on these commands:
 * the 2nd command (python) is used to invoke GSAS-II scriptable for the first time, which is needed to load the binary files from the server.
 
 
-Optional Python Packages
+---------------------------
+ Optional Python Packages
 ---------------------------
 
 * Sphinx (https://www.sphinx-doc.org) is used to generate the