CI: fixing image links in documentation

Signed-off-by: Raphael Defosseux <raphael.defosseux@eurecom.fr>

doc/L2NFAPI.md

@@ -2,7 +2,7 @@
   <tr style="border-collapse: collapse; border: none;">
     <td style="border-collapse: collapse; border: none;">
       <a href="http://www.openairinterface.org/">
-         <img src="../images/oai_final_logo.png" alt="" border=3 height=50 width=150>
+         <img src="./images/oai_final_logo.png" alt="" border=3 height=50 width=150>
          </img>
       </a>
     </td>

doc/L2NFAPI_S1.md

@@ -2,7 +2,7 @@
   <tr style="border-collapse: collapse; border: none;">
     <td style="border-collapse: collapse; border: none;">
       <a href="http://www.openairinterface.org/">
-         <img src="../images/oai_final_logo.png" alt="" border=3 height=50 width=150>
+         <img src="./images/oai_final_logo.png" alt="" border=3 height=50 width=150>
          </img>
       </a>
     </td>
@@ -301,4 +301,4 @@ Testing on the CI process is currently limited at time of writing. Improvements
 
 [oai softmodem build procedure](BUILD.md)
 
-[L2 nfapi simulator](L2NFAPI.md)
+[L2 nfapi simulator](L2NFAPI.md)
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