[geary] Fix typo on the manual's search page

[Michael Gratton <mjog src gnome org>]

commit 8cbc76a41d974a52f497a56fb0f4468c5c377c87
Author: Michael Gratton <mike vee net>
Date:   Tue Jan 29 16:46:28 2019 +1100

    Fix typo on the manual's search page
    
    Fixes #192

 help/C/search.page | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/help/C/search.page b/help/C/search.page
index b2d0d000..e3ce0629 100644
--- a/help/C/search.page
+++ b/help/C/search.page
@@ -61,10 +61,10 @@
        </tr>
        <tr>
                <td><p><input>to:<var>recipient</var></input></p></td>
-               <td><p>Finds messages where <var>sender</var> matches the To, CC, or BCC header.</p></td>
+               <td><p>Finds messages where <var>recipient</var> matches the To, CC, or BCC header.</p></td>
        </tr>
        </table>
-       
+
        <p>As a special case, the <input>bcc</input>, <input>cc</input>, <input>from</input>, and
        <input>to</input> operators support <input>me</input> as their argument, which searches for the
        account's email address in the appropriate context.</p>