Refine font size parameter descriptions in wordcloud.xml (#1850)

* Refine font size parameter descriptions in wordcloud.xml

As suggested by @RZ9082, I updated the help text for the min_font_size parameter to clarify its effect on word frequency scaling.
I deleted extra spaces and renamed the label as well.

@RZ9082 could you please check if this makes sense and is syntactically correct here? Thanks a lot for pointing this out!

* Update tools/wordcloud/wordcloud.xml

thank you!

Co-authored-by: Rand Zoabi <58028465+RZ9082@users.noreply.github.com>

* Update wordcloud.xml

* Update test data

---------

Co-authored-by: Rand Zoabi <58028465+RZ9082@users.noreply.github.com>
Co-authored-by: Björn Grüning <bjoern@gruenings.eu>
Co-authored-by: RZ9082 <randzoabi.rz@gmail.com>

Author: 3 people

tools/wordcloud/test-data/output0.png

@@ -2,7 +2,8 @@
     <description>with highly customizable appearance</description>
     <macros>
         <token name="@TOOL_VERSION@">1.9.4</token>
-        <token name="@VERSION_SUFFIX@">4</token>
+        <token name="@TOOL_VERSION@">1.9.6</token>
+        <token name="@VERSION_SUFFIX@">0</token>
         <token name="@PROFILE@">23.0</token>
     </macros>
     <requirements>
@@ -110,8 +111,8 @@
             </when>
         </conditional>
 
-        <param argument="--min_font_size" type="integer" min="1" value="4" optional="true" label=" Smallest font size to use" />
-        <param argument="--max_font_size" type="integer" min="1" optional="true" label="Maximum font size for the largest word" />
+        <param argument="--min_font_size" type="integer" min="1" value="4" optional="true" label="Smallest font size to show" help="The size will be scaled depending on the word frequency. By changing this value, you can exclude words smaller than the selected size."/>
+        <param argument="--max_font_size" type="integer" min="1" optional="true" label="Maximum font size for the largest word"/>
         <param argument="--font_step" type="integer" value="1" label="Step size for the font" help="Font_step &gt; 1 might speed up computation but give a worse fit"/>
         <param argument="--min_word_length" type="integer" value="0" optional ="True" label="Minimum number of letters a word must have to be included"/>
         <param argument="--max_words" type="integer" min="1" value="200" optional="true" label="Maximum number of words"/>