fix malicious typo

Author: timwr

documentation/modules/exploit/multi/http/git_submodule_exec.md

@@ -23,7 +23,7 @@
   1. Do: ```set SRVHOST [local host]```
   1. Do: ```set LHOST [local host]```
   1. Do: ```exploit```
-  1. Clone the malicous Git URI and its submodules
+  1. Clone the malicious Git URI and its submodules
   1. You should get a shell
 
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