2.7.0.txt: fix typos

Documentation/RelNotes/2.7.0.txt

@@ -30,8 +30,8 @@ Changes since v2.6.0
   from the popups `magit-branch-popup', `magit-pull-and-fetch-popup',
   `magit-pull-popup', `magit-fetch-popup', and `magit-push-popup'.
 
-  With a prefix argument it reads a the branch to be configured in
-  the minibuffer instead of using the current branch.
+  With a prefix argument it reads a branch to be configured in the
+  minibuffer instead of using the current branch.
 
 * Added new option `magit-branch-popup-show-variables', defaulting to
   t to avoid changing key bindings.  When set to nil, no variables are
@@ -41,7 +41,7 @@ Changes since v2.6.0
 * Added new popup command `magit-log-buffer-file-popup'.
 
 * Added new command `magit-diff-buffer-file' and new option
-  `magit-diff-buffer-file-locked'.  The the value of the option is
+  `magit-diff-buffer-file-locked'.  The value of the option is
   non-nil, the default, then the command uses a dedicated buffer.
 
 * Added new option `magit-log-buffer-file-locked'.  When its value is