fixed typo and defined MRIs acronym

Author: andreped

index.html

@@ -76,7 +76,7 @@
 <div class="w3-container" style="padding:128px 16px" id="about">
   <h3 class="w3-center">ABOUT Raidionics</h3>
   <p class="w3-center w3-large">Software for automatic segmentation and generation of standardized clinical reports of brain tumors
-    from pre-operative MRI volumes. Supported tumor types are: <i>glioblastomas</i>, <i>diffuse lower-grade gliomas</i>,
+    from preoperative magnetic resonance images (MRIs). Supported tumor types are: <i>glioblastomas</i>, <i>diffuse lower-grade gliomas</i>,
     <i>meningiomas</i>, and <i>metastases</i>.</p>
   <p class="w3-center w3-large"> A description of the different use-cases supported by Raidionics, along with Youtube presentation videos,
     are available on our <a href="https://github.com/dbouget/Raidionics/wiki"> <strong>wiki</strong></a>.</p>