Fix example and reference version matching syntax

Address documentation issue raised in #2759

docs/chart_best_practices/requirements.md

@@ -7,10 +7,12 @@ This section of the guide covers best practices for `requirements.yaml` files.
 Where possible, use version ranges instead of pinning to an exact version. The suggested default is to use a patch-level version match:
 
 ```yaml
-version: ^1.2.0
+version: ~1.2.3
 ```
 
-This will match version 1.2.0 and any patches to that release (1.2.1, 1.2.999, and so on)
+This will match version `1.2.3` and any patches to that release.  In other words, `~1.2.3` is equivalent to `>= 1.2.3, < 1.3.0`
+
+For the complete version matching syntax, please see the [semver documentation](https://github.com/Masterminds/semver#checking-version-constraints)
 
 ### Repository URLs
 
@@ -42,4 +44,4 @@ tags:
   - webaccelerator
 ```
 
-This allows a user to turn that feature on and off with one tag.
+This allows a user to turn that feature on and off with one tag.
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