Update some wording in the accessibility pages

Author: dpvc

basic/a11y-extensions.rst

@@ -9,7 +9,7 @@ MathJax offers accessibility support via its own built-in extensions
 that provide a choice of support options as well as a high degree of
 personalization.  The extensions can be activated either via the
 context menu, which itself is fully accessible, or a page author can
-control the default settings using the Mathjax configuration object.
+control the default settings using the MathJax configuration object.
 When the menu component is available, configuration should be done
 using the :ref:`MathJax menu options <menu-options>`, otherwise use
 the :ref:`accessibility options <accessibility-options>`.
@@ -84,18 +84,18 @@ the |bkey| S |ekey| key.
 There are a number of different rule sets that can be chosen for
 translating math to text, where each can have a number of different
 preferences for how a particular expression is spoken.  By default,
-MathJax uses `ClearSpeak`, however, the `Speech` sub-menu allows
-also provides the `MathSpeak` option.
-
-Each rule set has several different preference settings; three in the
-case of MathSpeak, for example, which primarily influence the length
-of produced text. ClearSpeak,
-on the other hand, has a large number of preferences that allow very
-fine-tuned control over how different types of expressions are
-spoken. The MathJax menu allows a smart choice of preferences by only
-displaying the preferences that are relevant for the sub-expression
-that is currently selected.  The `Select Preferences` option opens a
-selection box for all possible ClearSpeak preference choices.
+MathJax uses `ClearSpeak`, however, the `Speech` sub-menu also
+provides the `MathSpeak` option.
+
+Each rule set has several different preference settings --- three in
+the case of MathSpeak, for example, which primarily influence the
+length of the speech text that it produces. ClearSpeak, on the other
+hand, has a large number of preferences that allow very fine-tuned
+control over how different types of expressions are spoken. The
+MathJax menu allows a smart choice of preferences by only displaying
+the preferences that are relevant for the sub-expression that is
+currently selected.  The `Select Preferences` option opens a selection
+box for all possible ClearSpeak preference choices.
 
 Some rule-set and preference settings can be controlled by keyboard
 commands. This allows the user to have the same expression read in
@@ -116,8 +116,8 @@ underlying LaTeX expressions, when available, as is currently being
 taught in gradeschools in a number of European countries.
 
 In addition to voicing the sub-expressions during exploration, the
-explorer allows for queries on sub-expression, such as getting
-positional information with respect to the context, as well as
+explorer allows queries on sub-expressions, such as getting positional
+information with respect to the context, as well as obtaining
 summaries of the sub-expression currently being explored.  See the
 :ref:`explorer-commands` section for details.
 
@@ -130,7 +130,7 @@ Highlighting
 During interactive exploration, the sub-expression that is being
 explorered is automatically highlighted, by default with a blue
 background color. The highlighting can be customized by changing
-`Background` or `Foreground` colors in in the `Highlight` sub-menu of
+`Background` or `Foreground` colors in the `Highlight` sub-menu of
 the `Explorer` section of the MathJax contextual menu.  In addition,
 the opacity of both `Background` and `Foreground` can be adjusted by
 two slider bars underneath the respective sub-menus.
@@ -185,7 +185,7 @@ hovering over it with the mouse pointer. The choices here are:
   is dependent on the context of a sub-expression in the overall expression.
 * `Prefix`
   is information pertaining to the position of a
-  sub-expression. Examples are ``'exponent'``, ``'radicand'``, etc. These would
+  sub-expression. Examples are ``exponent``, ``radicand``, etc. These would
   also be spoken during interactive exploration.
 
 For more details on all of these concepts, see also the documentation of the
@@ -213,7 +213,7 @@ return the expression to its original form.  Collapsible expressions
 can also be discovered using some of the highlighting features, as
 described above.
 
-The ability to collapse sub-expressinos is controlled by the
+The ability to collapse sub-expressions is controlled by the
 `Collapsible Math` setting in the `Options` sub-menu of the MathJax
 contextual menu.  This feature is off by default, but can be selected
 by the user, or the default can be changed by the page author using

basic/explorer-commands.rst

@@ -96,7 +96,7 @@ Advanced Keys
     possible. The speech-text is regenerated to match.
 
 |bkey| Home |ekey|
-    Jump directly to the top-most level of expression.
+    Jump directly to the top-most level of the expression.
 
 -----
 
@@ -174,4 +174,9 @@ In that case, you will have to enter focus mode manually in order to
 use the explorer.  How this is done depends on the screen reader, so
 consult its documentation for details.
 
+Once the focus mode is started, you may need to exit focus mode
+manually when you are done exploring the expression.  How that is done
+depends on the screen reader, so consult the reader's documentation
+for details on how to accomplish that.
+
 |-----|