fixing grammatical errors and typos

docs/source/extending/frontend_extensions.rst

@@ -141,7 +141,7 @@ Defining and registering your own actions
 As part of your front-end extension, you may wish to define actions, which can
 be attached to toolbar buttons, or called from the command palette. Here is an
 example of an extension that defines an (not very useful!) action to show an
-alert, and adds a toolabr button using the full action name:
+alert, and adds a toolbar button using the full action name:
 
 .. code:: javascript
 

docs/source/extending/keymaps.rst

@@ -7,19 +7,19 @@ Customize keymaps
     which is not guaranteed to be kept in future versions of the notebook,
     and can be removed or changed without warnings.
 
-The notebook shortcuts that are defined by jupyter both in edit mode and command
-mode are configurable in the frontend configuration file
-``~/.jupyter/nbconfig/notebook.json``. The modification of Keyboard shortcut
-suffer of several limitations, mainly that your Browser and OS might prevent
-certain shortcut to work correctly. If this is the case, there are
-unfortunately not much than can be done. The second issue can arise with
-keyboard that have a layout different than US English. Again even if we are
-aware of the issue, there is not much we can do about that.
+The notebook shortcuts that are defined by jupyter both in edit mode and 
+command mode are configurable in the frontend configuration file
+``~/.jupyter/nbconfig/notebook.json``. The modification of keyboard 
+shortcuts suffers from several limitations, mainly that your Browser and OS 
+might prevent certain shortcuts from working correctly. If this is the case,
+there is unfortunately not much that can be done. The second issue can arise
+with keyboards that have a layout different than US English. Again, even if 
+we are aware of the issue, there is not much that can be done.
 
-Shortcut are also limited by the underlying library that handle code and text
-edition: CodeMirror. If some Keyboard shortcuts are conflicting, the method
-describe below might not work to create new keyboard shortcuts, especially in
-the ``edit`` mode of the notebook.
+Shortcuts are also limited by the underlying library that handles code and 
+text editing: CodeMirror. If some keyboard shortcuts are conflicting, the 
+method described below might not work to create new keyboard shortcuts, 
+especially in the ``edit`` mode of the notebook.
 
 
 The 4 sections of interest in ``~/.jupyter/nbconfig/notebook.json`` are the
@@ -30,15 +30,16 @@ following:
   - ``keys.command.bind``
   - ``keys.edit.bind``
 
-The first two section describe which default keyboard shortcut not to register
-at notebook startup time. These are mostly useful if you need to ``unbind`` a
-default keyboard shortcut before binding it to a new ``command``.
+The first two sections describe which default keyboard shortcuts not to 
+register at notebook startup time. These are mostly useful if you need to 
+``unbind`` a default keyboard shortcut before binding it to a new 
+``command``.
 
-These two first sections apply respectively to the ``command`` and ``edit``
-mode of the notebook. They take a list of shortcut to ``unbind``.
+The first two sections apply respectively to the ``command`` and ``edit``
+mode of the notebook. They take a list of shortcuts to ``unbind``.
 
 For example, to unbind the shortcut to split a cell at the position of the
-cursor (``Ctrl-Shift-Minus``)use the  following:
+cursor (``Ctrl-Shift-Minus``) use the following:
 
 .. code:: javascript
 
@@ -57,16 +58,16 @@ cursor (``Ctrl-Shift-Minus``)use the  following:
 
 
 
-The last two section describe which new keyboard shortcut to register
-at notebook startup time, and which actions they trigger.
+The last two sections describe which new keyboard shortcuts to register
+at notebook startup time and which actions they trigger.
 
-These two last sections apply respectively to the ``command`` and ``edit``
+The last two sections apply respectively to the ``command`` and ``edit``
 mode of the notebook. They take a dictionary with shortcuts as ``keys`` and
 ``commands`` name as value.
 
 For example, to bind the shortcut ``G,G,G`` (Press G three time in a row) in
-command mode, to the command that restart the kernel and run all cells, use the
-following:
+command mode to the command that restarts the kernel and runs all cells, use
+the following:
 
 
 .. code:: javascript
@@ -86,5 +87,5 @@ following:
 
 
 
-The name of the available ``commands`` can be find by hovering the right end of
-a row in the command palette.
+The name of the available ``commands`` can be find by hovering over the 
+right end of a row in the command palette.