Update README.md (#3149)

Author: domenukk

fuzzers/binary_only/frida_executable_libpng/README.md

@@ -1,4 +1,4 @@
-# Fuzzing libpng with frida as executale
+# Fuzzing libpng with frida as executable
 
 This folder contains an example fuzzer for libpng, using LLMP for fast multi-process fuzzing and crash detection.
 To show off crash detection, we added a ud2 instruction to the harness, edit harness.cc if you want a non-crashing example.
@@ -33,4 +33,4 @@ After building the libpng-harness, you can run `find . -name libpng-harness` to
 
 ```
 LD_PRELOAD=./target/release/libfrida_fuzzer.so ./libpng-harness -i corpus -o out -l ./libpng-harness.so
-```
+```