Clean up a few markdown setting descriptions (microsoft#164765)

Clean up wording and make sure we use `Markdown` uppercase

Author: mjbvz

extensions/markdown-language-features/package.nls.json

@@ -30,8 +30,8 @@
 	"configuration.markdown.links.openLocation.description": "Controls where links in Markdown files should be opened.",
 	"configuration.markdown.links.openLocation.currentGroup": "Open links in the active editor group.",
 	"configuration.markdown.links.openLocation.beside": "Open links beside the active editor.",
-	"configuration.markdown.suggest.paths.enabled.description": "Enable/disable path suggestions for markdown links",
-	"configuration.markdown.editor.drop.enabled": "Enable/disable dropping into the markdown editor to insert shift. Requires enabling `#editor.dropIntoEditor.enabled#`.",
+	"configuration.markdown.suggest.paths.enabled.description": "Enable/disable path suggestions while writing links in Markdown files.",
+	"configuration.markdown.editor.drop.enabled": "Enable/disable dropping files into a Markdown editor by holding down shift. Requires enabling `#editor.dropIntoEditor.enabled#`.",
 	"configuration.markdown.editor.pasteLinks.enabled": "Enable/disable pasting files into a Markdown editor inserts Markdown links. Requires enabling `#editor.experimental.pasteActions.enabled#`.",
 	"configuration.markdown.validate.enabled.description": "Enable/disable all error reporting in Markdown files.",
 	"configuration.markdown.validate.referenceLinks.enabled.description": "Validate reference links in Markdown files, e.g. `[link][ref]`.  Requires enabling `#markdown.validate.enabled#`.",