Little documentation typo fix

Here's a quick patch for a typo I found when reading the docs.

From 98f6d06dc1b4a01f88a75fcc1dcb574ea17f7045 Mon Sep 17 00:00:00 2001
From: Josiah Ritchie <ritchie.josiah@solute.us>
Date: Mon, 21 Dec 2020 15:33:28 -0500
Subject: [PATCH] Spelling fix

---
 docs/4_configuration.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/docs/4_configuration.md b/docs/4_configuration.md
index 2f4ac3e..0656a0c 100644
--- a/docs/4_configuration.md
+++ b/docs/4_configuration.md
@@ -111,7 +111,7 @@ Big Bang deploys four flux resources that can be customized:
 |--|--|--|
 | GitRepository | Environment | Top-level manifest (e.g. `dev.yaml`, `prod.yaml`)
 | Kustomization | Environment | Top-level manifest (e.g. `dev.yaml`, `prod.yaml`)
-| GitRepostiory | Big Bang | [Link](../base/gitrepository.yaml) |
+| GitRepository | Big Bang | [Link](../base/gitrepository.yaml) |
 | HelmRelease | Big Bang | [Link](../base/helmrelease.yaml) |
 
 In addition, each package contains its own GitRepository and HelmRelease resource that can be customized.  Look in the [Helm chart templates](../chart/templates) for the these resources.
-- 
2.27.0