[Docs] Add language identifiers to fenced code blocks (#28955)

Add language identifiers to code blocks

examples/pytorch/README.md

@@ -53,7 +53,7 @@ Coming soon!
 Most examples are equipped with a mechanism to truncate the number of dataset samples to the desired length. This is useful for debugging purposes, for example to quickly check that all stages of the programs can complete, before running the same setup on the full dataset which may take hours to complete.
 
 For example here is how to truncate all three splits to just 50 samples each:
-```
+```bash
 examples/pytorch/token-classification/run_ner.py \
 --max_train_samples 50 \
 --max_eval_samples 50 \
@@ -62,7 +62,7 @@ examples/pytorch/token-classification/run_ner.py \
 ```
 
 Most example scripts should have the first two command line arguments and some have the third one. You can quickly check if a given example supports any of these by passing a `-h` option, e.g.:
-```
+```bash
 examples/pytorch/token-classification/run_ner.py -h
 ```
 

examples/pytorch/speech-recognition/README.md

@@ -277,7 +277,7 @@ language or concept the adapter layers shall be trained. The adapter weights wil
 accordingly be called `adapter.{<target_language}.safetensors`.
 
 Let's run an example script. Make sure to be logged in so that your model can be directly uploaded to the Hub.
-```
+```bash
 huggingface-cli login
 ```