Fix typos in README

corpus_builder/README.md

@@ -5,27 +5,27 @@
 Corpus Builder is an ad-hoc desktop application that was written to
 help building the Cadasym image corpus. When the application starts
 up, it asks for PDFs with scanned cadastral mutation plans.  After
-converting them to pixmaps, basic Computer Vision algorithms (from the
-OpenCV library) are used to find potential cadastral symbols.  The
-symbol candidates are presented to the user, who manually classifies
-each symbol to build up the image corpus. After a candidate has been
-classificed, the corpus builder app stores a cropped 256×256 pixel image
-into the `corpus` folder.
+rendering the selected PDFs to pixel maps, the app uses old-school
+Computer Vision to find potential cadastral symbols.  These are
+presented to the user, who manually classifies the symbols.  After
+manual classification, Corpus Builder stores cropped 256×256 pixel
+images in PNG format into the `corpus` folder.
 
 
 ## Setup
 
 ```sh
-git clone https://github.com/brawer/cadasym.git
-cd cadasym
-python3 -m venv venv
-venv/bin/pip3 install -r requirements.txt
-venv/bin/python3 -m corpus_builder
+$ git clone https://github.com/brawer/cadasym.git
+$ cd cadasym
+$ python3 -m venv venv
+$ ./venv/bin/pip3 install -r requirements.txt
+$ ./venv/bin/python3 -m corpus_builder
 ```
 
 ## License
 
-The source code to this app is eleased under the
-[../LICENSES/MIT.txt](MIT license).
+Copyright 2024 by Sascha Brawer, released under the
+[MIT license](https://github.com/brawer/cadasym/blob/main/LICENSES/MIT.txt).
+