Fix typo in README.md file (#19)

Fixed a couple of  typos.

Co-authored-by: Adnan ELARAJI <7360655+aelaraji@users.noreply.github.com>
Reviewed-on: https://git.mills.io/prologic/zs/pulls/19
Reviewed-by: James Mills <james@mills.io>
Co-authored-by: Adnan ELARAJI <aelaraji@noreply@mills.io>
Co-committed-by: Adnan ELARAJI <aelaraji@noreply@mills.io>

README.md

@@ -51,7 +51,7 @@ EOF
 zs serve
 ```
 
-For a starter template see the [zs-starter-template](https://git.mills.io/prologic/zs-stater-template) which can also be found running live at [zs.mills.io](https://zs.mills.io).
+For a starter template see the [zs-starter-template](https://git.mills.io/prologic/zs-starter-template) which can also be found running live at [zs.mills.io](https://zs.mills.io).
 
 ## Features
 
@@ -99,7 +99,7 @@ Markdown text goes after a header *separator*
 ```
 
 Use placeholders for variables and plugins in your markdown or html
-files, e.g. `{{ title }}` or `{{ command arg1 arg2 }}.
+files, e.g. `{{ title }}` or `{{ command arg1 arg2 }}`.
 
 Write extensions in any language you like and put them into the `.zs`
 sub-directory.
@@ -159,7 +159,7 @@ For a full-list of default extensions enabled, see `zs --help` and the `-e/--ext
 Plugins are just executables in any language that output content. They can be system executables like `data` or custom scripts or programs that you place in `.zs/`. To use a plugins simply reference it in your content like so:
 
 ```markdown
-Site last updated at {{{ date }}
+Site last updated at {{ date }}
 ```
 
 or: