Change train/test split ratio from 80/20 to 85/15 (#3644)

Typo in text

I skipped the standard process because this change is so small. I do
believe it's still meaningful, as a typo in a tutorial can confuse and /
or dissuade learners.

Happy to go through full testing procedure if required, but that will
take more time.

Fixes #ISSUE_NUMBER

## Description
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## Checklist
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- [ ] The issue that is being fixed is referred in the description (see
above "Fixes #ISSUE_NUMBER")
- [ ] Only one issue is addressed in this pull request
- [ ] Labels from the issue that this PR is fixing are added to this
pull request
- [ ] No unnecessary issues are included into this pull request.

Author: stevenae

intermediate_source/char_rnn_classification_tutorial.py

@@ -205,7 +205,7 @@ def __getitem__(self, idx):
 print(f"example = {alldata[0]}")
 
 #########################
-#Using the dataset object allows us to easily split the data into train and test sets. Here we create a 80/20
+#Using the dataset object allows us to easily split the data into train and test sets. Here we create a 85/15
 # split but the ``torch.utils.data`` has more useful utilities. Here we specify a generator since we need to use the
 #same device as PyTorch defaults to above.
 
@@ -440,4 +440,4 @@ def evaluate(rnn, testing_data, classes):
 #    -  Any word -> language
 #    -  First name -> gender
 #    -  Character name -> writer
-#    -  Page title -> blog or subreddit
+#    -  Page title -> blog or subreddit