Make alert message consistent w/ new mat2 doc

wiki/src/doc/encryption_and_privacy/remove_metadata.mdwn

@@ -53,7 +53,7 @@ files:
 1. Navigate to the folder containing the files that you want to remove
    metadata from.
 
-1. Select the files that you want to remove metadata from with the mouse.
+1. With the mouse, select the files that you want to remove metadata from.
 
 1. Right-click (on Mac, click with two fingers) on the files and choose
    <span class="guimenuitem">Remove metadata</span>.

wiki/src/doc/sensitive_documents/metadata.mdwn

 <div class="caution">
 
-<p>Most files contain metadata which is information characterizing the
-content of the file. For example:</p>
+<p>Most files contain metadata, which is information used to describe,
+identify, categorize, and locate files. For example:</p>
 
 <ul>
 <li>Cameras record data about when and where a picture was taken and what
@@ -12,12 +12,13 @@ and company information to texts and spreadsheets.</li>
 
 <p>Use <span
 class="application"><a href="https://0xacab.org/jvoisin/mat2">MAT</a></span> to
-clean the metadata from your files before publishing or sharing:</p>
+clean metadata from your files before publishing or sharing them:</p>
 
 <ol>
 <li>Open the <span class="application">Files</span> browser.</li>
-<li>Navigate to the folder containing the files that you want to clean.</li>
-<li>Select the files that you want to clean.</li>
+<li>Navigate to the folder containing the files that you want to remove
+   metadata from.</li>
+<li>With the mouse, select the files that you want to remove metadata from.</li>
 <li>Right-click (on Mac, click with two fingers) on the files and choose
 <strong>Remove metadata</strong>.</li>
 </ol>