Fix some doc strings

ebib-utils.el

@@ -1291,7 +1291,7 @@ Currently, the following problems are marked:
 (defvar ebib--entry-history '(:head 0 :history nil)
   "History of entries visited.
 `:history' is a list of all entries visited, with more recent
-entries nearer the beginning. `:head' is a 0-based index
+entries nearer the beginning.  `:head' is a 0-based index
 indicating where in the `:history' list we are currently.
 
 Commands which navigate between entries (including those which
@@ -1300,8 +1300,8 @@ navigate the history) should (in order):
   `:history' list, reverse the result, and prepend it to the history
   list (unless the `:head' value is less than 2, in which case nothing
   would be prepended).
-- prepend the key of the entry arrived at to the `:history' list.
-- set `:head' to 0
+- Prepend the key of the entry arrived at to the `:history' list.
+- Set `:head' to 0
 
 Passing the relevant key to `ebib--history-mutate' will achieve
 all of this in a convenient way.")
@@ -2689,15 +2689,14 @@ specified in `ebib-field-sort-functions-alist', with
   ;; Now return the list of keys.
   keys)
 
-;; History commands
-
+;;; History commands
 
 (defun ebib--history-mutate (key)
   "Alter `ebib--entry-history' list.
 Copy everything from the second element to the element at
 `ebib--history-get-head' in the `:history' list in
 `ebib--entry-history', reverse the result, and prepend it to the
-history list. Then prepend KEY to the history list as well.
+history list.  Then prepend KEY to the history list as well.
 Finally, set `:head' in `ebib--entry-history' to 0."
   (when-let ((head (ebib--history-get-head))
 	     ;; Only bother if head is sufficiently large, otherwise

ebib.el

@@ -1653,7 +1653,7 @@ interactively."
 (defun ebib-history-back ()
   "Jump to the last visited entry.
 Repeated invocations of this function and `ebib-history-forward'
-move back and forward in history without changing it. After this,
+move back and forward in history without changing it.  After this,
 moving somewhere else copies the sequence of moves through
 history into the history record, so that they can still be
 accessed."
@@ -1671,7 +1671,7 @@ accessed."
 (defun ebib-history-forward ()
   "Jump to the entry visited before the current one in the history.
 Repeated invocations of this function and `ebib-history-back'
-move forward and back in history without changing it. After this,
+move forward and back in history without changing it.  After this,
 moving somewhere else copies the sequence of moves through
 history into the history record, so that they can still be
 accessed."