fix some help typos

vimperator/TODO

@@ -25,6 +25,7 @@ BUGS:
 - BookmarkAdd is fired once for each bookmark periodically i.e. not in response to adding a bookmark
 
 FEATURES:
+9 finish :help TODOs
 9 fix local options
 9 adaptive timeout for auto-completions, :set completions can be updated more often than
   :open foo

vimperator/locale/en-US/eval.txt

@@ -26,8 +26,8 @@ ________________________________________________________________________________
 |:echom| |:echomsg|
 ||:echom[sg] {expr}|| +
 ________________________________________________________________________________
-Echo the expression as an infomational message. Just like [c]:ec[ho][c], but
-also saves the message in the the message history.
+Echo the expression as an informational message. Just like [c]:ec[ho][c], but
+also saves the message in the message history.
 ________________________________________________________________________________
 
 

vimperator/locale/en-US/map.txt

@@ -144,7 +144,7 @@ ________________________________________________________________________________
 |:map-<silent>| +
 ________________________________________________________________________________
 When the first argument to one of the mapping commands is <silent>, {rhs}
-is not echoed to the commandline, nor, for that matter, is anything else
+is not echoed to the command-line, nor, for that matter, is anything else
 until the command has completed.
 ________________________________________________________________________________
 
@@ -324,7 +324,7 @@ Custom completion
 
 Custom completion can be provided by specifying the "custom,{func}" argument to
 -complete. The {func} is called with two arguments, a completion context, and
-an an object describing the command's arguments. It should set the context's
+an object describing the command's arguments. It should set the context's
 \'completions' property, or return an object, with \'start' and \'items'
 properties, describing the completions and where the replacement is to start.
 

vimperator/locale/en-US/options.txt

@@ -734,7 +734,7 @@ ____
 |\'novb'| |\'novisualbell'| |\'vb'| |\'visualbell'|
 ||'visualbell' 'vb'|| boolean (default: off)
 ____
-Use visual bell instead of beeping on errors.  The visualbell style is
+Use visual bell instead of beeping on errors.  The visual bell style is
 controlled by [c]:hi Bell[c].  If no bell is desired use [c]:set t_vb=[c] together with
 this option.
 ____

vimperator/locale/en-US/tutorial.txt

@@ -62,8 +62,8 @@ and you can find out about the [m]gt[m] and [m]gT[m] mapping with
   :help gt<CR>
   :help gT<CR>
 
-Finally, in addition to the help system itself, [c]:exusage[c] and
-[c]:viusage[c] are useful quick-reference commands.
+Finally, in addition to the help system itself, [c]:exusage[c], [c]:viusage[c]
+and [c]:optionusage[c] are useful quick-reference commands.
 
 section:Mouseless[living-mouseless]