Sdtrig: Clarify that all triggers share the same tinfo.version

The purpose of "tinfo.version" field is to describe the version
of the whole Sdtrig implementation.

Add an explanatory note to make it clearer to spec readers that
this means that all triggers will share the same tinfo.version
value.

Author: JanMatCodasip

xml/hwbp_registers.xml

@@ -177,6 +177,13 @@ same project unless stated otherwise.
         <field name="0" bits="XLEN-1:32" access="R" reset="0" />
         <field name="version" bits="31:24" access="R" reset="Preset">
             Contains the version of the Sdtrig extension implemented.
+
+            [NOTE]
+            ====
+            This field refers to the version of the whole Sdtrig extension.
+            For that reason, all triggers contain the same version number.
+            ====
+
             <value v="0" name="0">
                 Supports triggers as described in this spec at commit 5a5c078,
                 made on February 2, 2023.
@@ -195,9 +202,9 @@ same project unless stated otherwise.
         </field>
         <field name="0" bits="23:16" access="R" reset="0" />
         <field name="info" bits="15:0" access="R" reset="Preset">
-            One bit for each possible {tdata1-type} enumerated in {csr-tdata1}. Bit N
-            corresponds to type N. If the bit is set, then that type is
-            supported by the currently selected trigger.
+            One bit for each possible {tdata1-type} enumerated in {csr-tdata1}.
+            Bit N corresponds to type N. If the bit is set, then that type is
+            supported by the currently selected trigger (by {csr-tselect}).
 
             If the currently selected trigger doesn't exist, this field
             contains 1.