Enable max parallel threads to be set to a percentage of total cores available

Author: bjuric

docs/06-settings.mdx

@@ -2273,6 +2273,7 @@ Default value (empty to pick up Gwen default format: html)
   <p>Supported values</p>
   <ul>
     <li><code>auto</code> (since v3.18.0) or <code>0</code> to run one thread on each available cores (default)</li>
+    <li>A percentage of the total number of the cores available (since v4.3.0). For example: 80%</li>
     <li>
       Or positive integer value denoting the maximum number of threads to allow
       <ul>

docs/07-launcher.mdx

@@ -257,7 +257,7 @@ Default launch options and arguments can also be configured in [settings](/docs/
   <p>Optional switch for executing features or scenarios in parallel (one per CPU core) depending on the configured state level. Omit to execute sequentially.</p>
   </summary>
 
-  <p>Will utilise all avaialable CPU cores unless <Link to="/docs/settings#gwen-parallel-maxThreads"><code>gwen.parallel.maxThreads</code></Link> is configured with an explicit maximum.</p>
+  <p>Will utilise all avaialable CPU cores unless <Link to="/docs/settings#gwen-parallel-maxThreads"><code>gwen.parallel.maxThreads</code></Link> is configured with an explicit maximum or percentage.</p>
 
   <p>Examples</p>
 

docs/11-parallel.mdx

@@ -18,7 +18,8 @@ The maximum number of parallel threads can be controlled through the following s
 
 - [`gwen.parallel.maxThreads`](/docs/settings#gwen-parallel-maxThreads)
   - By default this is set to `auto`, meaning that one thread will execute on each available CPU core (for example: 8 threads would execute on an 8 core machine)
-  - This can be set to a desired number of threads
+  - This can be set to a percentage of the total number of cores available (for example, 80% would mean that 8 threads would execute on a 10 core machine)
+  - Or a desired number of threads
     - When less than the number of available cores, the remaining cores will be free
     - When greater than the number of available cores, more than one thread may execute on some or all cores (use judiciously)