Minor text tweaks

how-to/markdown.md

@@ -20,9 +20,9 @@ We support CommonMark, an extension of the original Markdown specifications.
 - unordered lists (with 2 levels of nesting)
 - links
   - the ones that start with the pathname will be styled as internal links (example: `[Species selector](/species-selector)`)
-  - the ones that contain a protocol and a host name will be styled as external links (example: `[HGNC](https://www.genenames.org/)`)
+  - the ones that contain a protocol and a host name will be styled as external links (example: `[HGNC](https://www.uniprot.org/)`)
 - inlined code and code blocks
-- tables (although markdown is poorly suited for tables, and it is possible you might want to use html to write them, see the next section)
+- tables (although markdown is poorly suited for tables, so you might want to use HTML to write them - see the next section)
 - images
 
 ### Custom formatting via HTML
@@ -37,7 +37,7 @@ This is a paragraph of plain markdown.
 <p class="special-color">Hey, look at this! This is HTML in a Markdown file!</p>
 ```
 
-The CommonMark spec even allows continuing writing Markdown inside of HTML tags, provided there remains an empty line between the HTML tag and the Markdown content, thus making the following use cases possible:
+The CommonMark spec even allows continuing writing Markdown inside of HTML tags, provided an empty line is left between the HTML tag and the Markdown content, thus making the following use cases possible:
 
 ```md
 # Example
@@ -53,7 +53,7 @@ And this is another paragraph, which will be displayed inside a box element.
 </div>
 ```
 
-Such sprinklings of HTML inside Markdown opens up the possibility of custom formatting, such as boxes, complex tables, etc. 
+Such sprinklings of HTML inside Markdown open up the possibility of custom formatting, such as boxes, complex tables, etc.