• VSCode Version: Code - Insiders 1.20.0-insider (673355d, 2018-01-22T05:14:14.888Z)
• OS Version: Windows_NT x64 10.0.17074
• Extensions (45)

  Extension	Author (truncated)	Version
  yandex-translate	air	1.0.5
  Bookmarks	ale	0.18.0
  sqf	Arm	1.0.4
  unique-lines	bib	1.0.0
  npm-intellisense	chr	1.3.0
  path-intellisense	chr	1.4.2
  gitignore	cod	0.5.0
  vscode-markdownlint	Dav	0.12.1
  vscode-eslint	dba	1.4.4
  xml	Dot	1.9.2
  gitlens	eam	7.5.6
  EditorConfig	Edi	0.12.0
  tslint	eg2	1.0.24
  vsc-material-theme	Equ	1.3.0
  vsc-figlet	fer	0.0.8
  file-icons	fil	1.0.7
  vscode-npm	fkn	3.3.0
  vscode-nginx-conf-hint	han	0.0.4
  npm-dependency-links	her	1.0.0
  minify	Hoo	0.3.0
  rest-client	hum	0.16.2
  discord-vscode	icr	2.1.0
  vscode-insertdatestring	jsy	2.2.0
  vscode-icon-theme	jtl	1.6.1
  indentation-level-movement	kai	1.1.1
  StarboundJson	Kyl	0.1.3
  vscode-JS-CSS-HTML-formatter	lon	0.2.3
  autoconf	mae	0.0.2
  vscode-todo-parser	min	1.9.1
  HTMLHint	mka	0.4.0
  python	ms-	0.9.1
  cpptools	ms-	0.14.6
  csharp	ms-	1.13.1
  mono-debug	ms-	0.15.8
  typescript-javascript-grammar	ms-	0.0.26
  node-modules-resolve	nau	1.0.2
  indent-rainbow	ode	0.7.2
  ejs-language-support	Qas	0.0.1
  vscode-icons	rob	7.19.0
  MDTools	sea	1.0.1
  code-settings-sync	Sha	2.8.7
  vscode-nginx	sha	0.5.0
  sqflint	ska	0.8.6
  vscode-wakatime	Wak	1.1.22
  html-css-class-completion	Zig	1.16.1

  (2 theme extensions excluded)

Steps to Reproduce:

1. Write an argument description in JSDocs with the markdown (bold in my case)

/**
* **Generates string with greeting**
* @param {string} username **Username** for the greeting.
*/
function greeting(username: string) {
  return `Hello, ${username}!`;
}

2. Hover over an argument name OR type the code to trigger the description tooltip

Excepted Result: Username for the greeting.

Actual Result: Username* for the greeting.

Example from my code (screenshot)

Reproduces without extensions: Yes