Fix typo in documentation

Signed-off-by: Stefan Weil <sw@weilnetz.de>

INSTALL.GIT.md

@@ -24,7 +24,7 @@ So, the steps for making Tesseract are:
 You need to install at least English language and OSD data files to TESSDATA_PREFIX
 directory. You can retrieve single file with tools like [wget](https://www.gnu.org/software/wget/), [curl](https://curl.haxx.se/), [GithubDownloader](https://github.com/intezer/GithubDownloader) or browser.
 
-All language data files can be retrieved from git repository (usefull only for packagers!):
+All language data files can be retrieved from git repository (useful only for packagers!):
 
     $ git clone https://github.com/tesseract-ocr/tessdata.git tesseract-ocr.tessdata