fix: spelling of TypeScript (#2389)

Author: lex111

docs/.vuepress/config.js

@@ -58,7 +58,7 @@ module.exports = {
             text: 'Plugins',
             items: [
               { text: 'Babel', link: 'https://github.com/vuejs/vue-cli/tree/dev/packages/%40vue/cli-plugin-babel' },
-              { text: 'Typescript', link: 'https://github.com/vuejs/vue-cli/tree/dev/packages/%40vue/cli-plugin-typescript' },
+              { text: 'TypeScript', link: 'https://github.com/vuejs/vue-cli/tree/dev/packages/%40vue/cli-plugin-typescript' },
               { text: 'ESLint', link: 'https://github.com/vuejs/vue-cli/tree/dev/packages/%40vue/cli-plugin-eslint' },
               { text: 'PWA', link: 'https://github.com/vuejs/vue-cli/tree/dev/packages/%40vue/cli-plugin-pwa' },
               { text: 'Jest', link: 'https://github.com/vuejs/vue-cli/tree/dev/packages/%40vue/cli-plugin-unit-jest' },
@@ -147,7 +147,7 @@ module.exports = {
             text: '插件',
             items: [
               { text: 'Babel', link: 'https://github.com/vuejs/vue-docs-zh-cn/blob/master/vue-cli-plugin-babel/README.md' },
-              { text: 'Typescript', link: 'https://github.com/vuejs/vue-docs-zh-cn/blob/master/vue-cli-plugin-typescript/README.md' },
+              { text: 'TypeScript', link: 'https://github.com/vuejs/vue-docs-zh-cn/blob/master/vue-cli-plugin-typescript/README.md' },
               { text: 'ESLint', link: 'https://github.com/vuejs/vue-docs-zh-cn/blob/master/vue-cli-plugin-eslint/README.md' },
               { text: 'PWA', link: 'https://github.com/vuejs/vue-docs-zh-cn/blob/master/vue-cli-plugin-pwa/README.md' },
               { text: 'Jest', link: 'https://github.com/vuejs/vue-docs-zh-cn/blob/master/vue-cli-plugin-unit-jest/README.md' },
@@ -236,7 +236,7 @@ module.exports = {
             text: 'Плагины',
             items: [
               { text: 'Babel', link: 'https://github.com/vuejs/vue-cli/tree/dev/packages/%40vue/cli-plugin-babel' },
-              { text: 'Typescript', link: 'https://github.com/vuejs/vue-cli/tree/dev/packages/%40vue/cli-plugin-typescript' },
+              { text: 'TypeScript', link: 'https://github.com/vuejs/vue-cli/tree/dev/packages/%40vue/cli-plugin-typescript' },
               { text: 'ESLint', link: 'https://github.com/vuejs/vue-cli/tree/dev/packages/%40vue/cli-plugin-eslint' },
               { text: 'PWA', link: 'https://github.com/vuejs/vue-cli/tree/dev/packages/%40vue/cli-plugin-pwa' },
               { text: 'Jest', link: 'https://github.com/vuejs/vue-cli/tree/dev/packages/%40vue/cli-plugin-unit-jest' },