Update check-spelling (#14873)

* Updating advice

Copying 18764e6cbb/.github/actions/spelling/advice.md

* Update exclusions

* sort exclusions
* exclude .filters files based on updated engine suggestions
* exclude src/modules/previewpane/UnitTests-MarkdownPreviewHandler/HelperFiles/MarkdownWithHTMLImageTag.txt based on updated engine suggestions

* Upgrade check-spelling to v0.0.20-alpha3

Updates patterns to better handle guids
closes #14854

Adds a couple of other patterns:
* publicKeyToken
* @sha256:
* std::wregex

Co-authored-by: Josh Soref <jsoref@users.noreply.github.com>
Co-authored-by: Jaime Bernardo <jaime@janeasystems.com>

.github/actions/spell-check/excludes.txt

@@ -3,6 +3,7 @@
 (?:^|/)(?i)LICEN[CS]E
 (?:^|/)package(?:-lock)\.json$
 (?:^|/)vendor/
+(?:^|/)WindowsSettings\.json$
 /package(?:-lock|)\.json$
 /pinyindb/
 /settings-html/
@@ -12,6 +13,7 @@ ignore$
 \.bmp$
 \.dat$
 \.dll$
+\.filters$
 \.gcode$
 \.gif$
 \.gitignore$
@@ -38,8 +40,8 @@ ignore$
 ^src/modules/powerrename/UWPui/pch\.h$
 ^src/modules/powerrename/UWPui/PowerRenameUWPUI\.vcxproj\.filters$
 ^src/modules/previewpane/PreviewPaneUnitTests/HelperFiles/MarkdownWithHTMLImageTag\.txt$
+^src/modules/previewpane/UnitTests-MarkdownPreviewHandler/HelperFiles/MarkdownWithHTMLImageTag.txt$
 ^tools/CleanUp_tool/CleanUp_tool\.vcxproj\.filters$
 ^\.github/
 ^\.github/actions/spell-check/
 ^\.gitmodules$
-(?:^|/)WindowsSettings\.json$