Docs: Fix spelling typos

Change-Id: I590cd157b2b0e2204c6789fa09343c0bdc59831c
Signed-off-by: Antonio de Angelis <antonio.deangelis@arm.com>
diff --git a/docs/index.rst b/docs/index.rst
index 9176967..3237422 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -76,7 +76,7 @@
    If your contribution consists of pre-bulit binaries, please upload your
    binary components to
    `Trusted Firmware binary repository (tf-binaries) <https://git.trustedfirmware.org/tf-binaries.git/about/>`_.
-   This respository accepts source files only.
+   This repository accepts source files only.
 
 Additional requirements
 =======================