Fixed punctuation in caching.md

This file had inconsistent use of the colon marker when referring to code. Some sentences ended with the colon (":") while others had no punctuation mark.

 - Added a colon after "add a line like the following to ~/.bashrc"
 - Added a colon after "downloading the models locally with"
 - Added a colon after “cache location with code like”

So now the file is consistent with lines that end like:

 - “through the Colab host:”
 - “workarounds for this situation:”

site/en/hub/caching.md

@@ -29,7 +29,7 @@ location `/tmp/tfhub_modules` (or whatever `os.path.join(tempfile.gettempdir(),
 Users who prefer persistent caching across system reboots can instead set
 `TFHUB_CACHE_DIR` to a location in their home directory. For example, a user of
 the bash shell on a Linux system can add a line like the following to
-`~/.bashrc`
+`~/.bashrc`:
 
 ```bash
 export TFHUB_CACHE_DIR=$HOME/.cache/tfhub_modules
@@ -41,7 +41,7 @@ persistent location, be aware that there is no automatic cleanup.
 ### Reading from remote storage
 
 Users can instruct the `tensorflow_hub` library to directly read models from
-remote storage (GCS) instead of downloading the models locally with
+remote storage (GCS) instead of downloading the models locally with:
 
 ```shell
 os.environ["TFHUB_MODEL_LOAD_FORMAT"] = "UNCOMPRESSED"
@@ -64,7 +64,7 @@ location by default. There are two workarounds for this situation:
 The easiest solution is to instruct the `tensorflow_hub` library to read the
 models from TF Hub's GCS bucket as explained above. Users with their own GCS
 bucket can instead specify a directory in their bucket as the cache location
-with code like
+with code like:
 
 ```python
 import os
@@ -83,4 +83,4 @@ load_options =
 tf.saved_model.LoadOptions(experimental_io_device='/job:localhost')
 reloaded_model = hub.load("https://tfhub.dev/...", options=load_options)
 ```
-**Note:** See more information regarding valid handles [here](tf2_saved_model.md#model_handles).
+**Note:** See more information regarding valid handles [here](tf2_saved_model.md#model_handles).