Make section title action oriented (#15670)

The previous ones mentioned the tool to be used instead of the goal to
be reached by the user. These ones should be easier to navigate.

wiki/src/doc/encryption_and_privacy/veracrypt.mdwn

@@ -81,24 +81,20 @@ volume was created:
   [See the <span class="application">VeraCrypt</span> documentation on hidden
   volumes.](https://www.veracrypt.fr/en/Hidden%20Volume.html)
 
-Unlocking a file container
-==========================
+Using a file container
+======================
 
 <a id="container-files"></a>
 
-Using the <span class="application">Files</span> browser
---------------------------------------------------------
+Unlocking a file container without keyfiles
+-------------------------------------------
 
-If your file container requires keyfiles to unlock, use
-the <span class="application">Disks</span> utility instead. See the [[Using
-the <span class="application">Disks</span> utility|veracrypt#containers-disks]] section
-below.
-
-1. To start the <span class="application">Files</span> browser, choose
+1. Choose
    <span class="menuchoice">
      <span class="guimenu">Applications</span>&nbsp;▸
      <span class="guisubmenu">Accessories</span>&nbsp;▸
-     <span class="guisubmenuitem">Files</span></span>.
+     <span class="guisubmenuitem">Files</span></span>
+   to start the <span class="application">Files</span> browser.
 
 1. Navigate to the folder containing the file container that you want to open.
 
@@ -127,14 +123,15 @@ below.
 
 <a id="container-disks"></a>
 
-Using the <span class="application">Disks</span> utility
---------------------------------------------------------
+Unlocking a file container with keyfiles
+----------------------------------------
 
-1. To start the <span class="application">Disks</span> utility, choose
+1. Choose
    <span class="menuchoice">
      <span class="guimenu">Applications</span>&nbsp;▸
      <span class="guisubmenu">Utilities</span>&nbsp;▸
-     <span class="guisubmenuitem">Disks</span></span>.
+     <span class="guisubmenuitem">Disks</span></span>
+   to start the <span class="application">Disks</span> utility.
 
 1. Choose <span class=menuchoice">
      <span class="guimenu">Disks</span>&nbsp;▸
@@ -201,27 +198,27 @@ Closing a file container
 
    [[!img eject-container.png link="no" alt=""]]
 
-Unlocking a partition
-=====================
+Using a partition
+=================
 
 <a id="partition-files"></a>
 
-Using the <span class="application">Files</span> browser
---------------------------------------------------------
-
-If your partition requires keyfiles to unlock or is on an internal hard disk,
-use the <span class="application">Disks</span> utility instead. See the [[Using
-the <span class="application">Disks</span> utility|veracrypt#partition-disks]]
-section below.
+Unlocking a partition without keyfiles
+--------------------------------------
 
-1. To start the <span class="application">Files</span> browser, choose
+1. Choose
    <span class="menuchoice">
      <span class="guimenu">Applications</span>&nbsp;▸
      <span class="guisubmenu">Accessories</span>&nbsp;▸
-     <span class="guisubmenuitem">Files</span></span>.
+     <span class="guisubmenuitem">Files</span></span>
+   to start the <span class="application">Files</span> browser.
 
 1. Plug in the USB stick or the hard disk which has the partition.
 
+   If your partition is on an internal hard disk, refer to [[Unlocking a
+   partition with keyfiles|veracrypt#partition-disks]]
+   instead.
+
 1. Click on the <span class="guilabel">Encrypted</span> label of the new volume
    that appears in the sidebar.
 
@@ -236,8 +233,8 @@ section below.
 
 <a id="partition-disks"></a>
 
-Using the <span class="application">Disks</span> utility
---------------------------------------------------------
+Unlocking a partition with keyfiles
+-----------------------------------
 
 1. If your partition is on an internal hard disk, [[set up an administration
    password|doc/first_steps/startup_options/administration_password]] when
@@ -245,11 +242,12 @@ Using the <span class="application">Disks</span> utility
    
    Otherwise, plug in the USB stick or the hard disk which has the partition.
 
-1. To start the <span class="application">Disks</span> utility, choose
+1. Choose
    <span class="menuchoice">
      <span class="guimenu">Applications</span>&nbsp;▸
      <span class="guisubmenu">Utilities</span>&nbsp;▸
-     <span class="guisubmenuitem">Disks</span></span>.
+     <span class="guisubmenuitem">Disks</span></span>
+   to start the <span class="application">Disks</span> utility.
 
 1. In the left pane, select the device that corresponds to your USB stick or
    hard disk.