deprecation typo fixes

Author: ShashiSubramanya

modules/ROOT/pages/deprecated-features.adoc

@@ -96,7 +96,7 @@ Recommended action::
 If your embed deployments are still using the legacy experience modes, we recommend that you enable the V3 navigation and home page experience in your development environments and evaluate the changes. For information on the features available in V3 experience mode, refer to the xref:full-app-customize.adoc[Full application embedding documentation].
 
 [#PNGFlowDeprecation]
-== Deprecating select options in PNG export
+== Deprecation of select options in PNG export
 The `include_cover_page` and `include_filter_page` options for the `POST /api/rest/2.0/report/liveboard` endpoint are now deprecated for PNG downloads.
 
 The Liveboard Report API has improved PNG export options which generate high-quality PNGs that closely match the Liveboard experience. It supports `image_resolution` (up to 3840px wide), `image_scale` (zoom), and allows developers to export a specific tab instead of stitching all tabs vertically.
@@ -123,7 +123,7 @@ The `/api/rest/2.0/template/variables/{identifier}/delete` and `/api/rest/2.0/te
 Impact on your instance::
 Your existing implementation will continue to work until further notice. However, these endpoints will be removed from ThoughtSpot in a future release. Therefore, ThoughtSpot recommends using the following new API endpoints: +
 ** `POST /api/rest/2.0/template/variables/{identifier}/update-values` +
-Assigns multiple values to variables and sets the scope for variable values in a single API request.
+Assigns multiple values to a variable and sets the scope for variable values in a single API request.
 ** `POST /api/rest/2.0/template/variables/delete` +
 Deletes one or more variables in a single API request.