[docs] Fix small SEO issues

docs/pages/blog/2020-developer-survey-results.md

@@ -315,5 +315,5 @@ We will run a similar survey next year to keep track of our progress.
 
 If you want to continue to influence our roadmap, please upvote 👍 the issues you are the most interested in on GitHub.
 
-<img src="/static/blog/2019-survey/vote.gif" style="width: 550px; margin-bottom: 8px;" alt="How to upvote on GitHub" />
+<img src="/static/blog/2019-developer-survey-results/vote.gif" style="width: 550px; margin-bottom: 8px;" alt="How to upvote on GitHub" />
 <p class="blog-description">Help us prioritize by upvoting.</p>

docs/pages/blog/mui-core-v5.md

@@ -477,7 +477,7 @@ Although each product has its unique vision and mission statements, they complem
   - Vision: Create the last UI component library developers will ever need. High quality, consistent, feature-rich, and covering the most frequent/challenging use-cases.
   - Mission: Make building rich, data-intensive, dynamic apps a breeze.
 
-MUI Core has a positive cash flow thanks to its paid templates, design assets, ads on the documentation, and backers/sponsors (❤️). The [MIT](https://tldrlegal.com/license/mit-license) license model works great for it.
+MUI Core has a positive cash flow thanks to its paid templates, design assets, ads on the documentation, and backers/sponsors (❤️). The [MIT](https://www.tldrlegal.com/license/mit-license) license model works great for it.
 
 However, none of these revenue sources would scale with the outcome and amount of work required for MUI X.
 It's why we are using an [open core license model](https://en.m.wikipedia.org/wiki/Open-core_model) for this new product.