(minor) fix formatting; add "upvoting" to cSpell.json

cSpell.json

@@ -72,6 +72,7 @@
     "techn",
     "ts-nocheck",
     "tuleap",
+    "upvoting",
     "verdana",
     "viewports",
     "vinod",

packages/mermaid/src/docs/community/development.md

@@ -1,6 +1,7 @@
 # Contributing to Mermaid
 
 ## Contents
+
 - [Technical Requirements and Setup](#technical-requirements-and-setup)
 - [Contributing Code](#contributing-code)
 - [Contributing Documentation](#contributing-documentation)
@@ -18,6 +19,7 @@ Here are a few things to get you started on the right path.
 ## Technical Requirements and Setup
 
 ### Technical Requirements
+
 These are the tools we use for working with the code and documentation.
 
 - [volta](https://volta.sh/) to manage node versions.
@@ -62,7 +64,7 @@ pnpm test
 
 The `test` script and others are in the top-level `package.json` file.
 
-All tests should run sucessfully without any errors or failures.  (You might see _lint_ or _formatting_ warnings; those are ok during this step.)
+All tests should run sucessfully without any errors or failures. (You might see _lint_ or _formatting_ warnings; those are ok during this step.)
 
 ## Contributing Code
 
@@ -187,7 +189,7 @@ The documentation has to be updated to users know that things have changed and a
 
 We know it can sometimes be hard to code _and_ write user documentation.
 
-_**[TODO - how to submit documentation changes.** A few words plus a link to  [Contributing Documentation](#contributing-documentation)_
+_**[TODO - how to submit documentation changes.** A few words plus a link to [Contributing Documentation](#contributing-documentation)_
 
 Create another issue specifically for the documentation.  
 You will need to help with the PR, but definitely ask for help if you feel stuck.
@@ -276,7 +278,7 @@ To edit Docs on GitHub:
 - search in the open Issues
 
 If you find an open issue or discussion thread that is similar to your question but isn't answered,
-you can let us know that you are also interested in it. **_[TODO: describe  upvoting]_**
+you can let us know that you are also interested in it. **_[TODO: describe upvoting]_**
 This helps the team know the relative interest in something and helps them set priorities and assignments.
 
 Feel free to add to the discussion on the issue or topic.