Fix Asciidoc syntax in License

Author: zbynek

LICENSE.adoc

@@ -3,10 +3,10 @@
 == Code
 
 This license applies code contributed to this repository which is generally
-used in the construction of the Jenkins website
+used in the construction of the Jenkins website.
 
 .MIT License
-""
+```
 Copyright (c) 2015-2016 CloudBees, Inc, and respective contributors
 
 Permission is hereby granted, free of charge, to any person obtaining a copy of
@@ -26,7 +26,7 @@ AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
-""
+```
 
 == Content
 
@@ -36,7 +36,7 @@ Atribution-ShareAlike 4.0] license applies, unless otherwise stated to the
 content created as part of this website, such as the Asciidoc or Markdown files
 inside of `content/`.
 
-image:::https://licensebuttons.net/l/by-sa/4.0/88x31.png[Attribution/Share-a-like]
+image::https://licensebuttons.net/l/by-sa/4.0/88x31.png[Attribution/Share-a-like]
 
 * link:https://creativecommons.org/licenses/by-sa/4.0/[Human-readable license text]
 * link:https://creativecommons.org/licenses/by-sa/4.0/legalcode[Full legal license text]