textopsx: docs - note about @hf_value2 select

(cherry picked from commit d13c741d90c3887cdf144a9094a78c0c7cb9856d)
(cherry picked from commit 70cf3ebd2b52c341a90c9b9b6149985667a6b96c)
(cherry picked from commit a0cef6e8689b66f7548fe56eaa79e692d5061e93)

src/modules/textopsx/doc/selects.xml

@@ -8,8 +8,8 @@
     <section id="textopsx.sel.hf_value">
 	<title>@hf_value</title>
 	<para>
-		Get value of required header-value or param. Note that functions called 'value2'
-		works with Authorization-like headers where comma is not treated as value delimiter. 
+		Get value of required header-value or param. Note that selects called 'hf_value2'
+		work with Authorization-like headers where comma is not treated as value delimiter.
 	</para>
 	<para>
 	Formats:
@@ -73,7 +73,9 @@ $prt = @hf_value2.authorization.integrity_protected;
     <section id="textopsx.sel.hf_value2">
 	<title>@hf_value2</title>
 	<para>
-		TBA.
+		Similar to selects called 'hf_value', but work with Authorization-like
+		headers where comma is treated as attribute delimiter instead of header
+		value delimiter.
 	</para>
     </section>
     <section id="textopsx.sel.hf_value_exists">