docs: Add max # of connections to known issues (#4405)

website/content/docs/release-notes/v0_15_0.mdx

@@ -178,6 +178,25 @@ description: |-
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+  <tr>
+    <td style={{verticalAlign: 'middle'}}>
+    0.15.0
+    </td>
+    <td style={{verticalAlign: 'middle'}}>
+    Maximum number of connections allowed is incorrect
+    </td>
+    <td style={{verticalAlign: 'middle'}}>
+    A known issue causes Boundary to permit one less than the allowed number of connections that you configured for a given target. For example, if you configured the session connection limit for a target at 2, Boundary only permits 1 connection to the target. If the value is 1, Boundary does not allow any connections to the target.
+    <br /><br />
+    This is a known issue that will be fixed in an upcoming release. A value of -1 still means that connections to the target are unlimited.
+    <br /><br />
+    Learn more:&nbsp;
+    Refer to the CLI docs for information about using <a href="/boundary/docs/commands/targets/create"><code>targets create</code></a> or <a href="/boundary/docs/commands/targets/update"><code>targets update</code></a> to configure a maximum number of connections.
+    <br /><br />
+    Refer to the API docs for information about using <a href="/boundary/api-docs/target-service">Target service</a> to configure a maximum number of connections.
+    </td>
+  </tr>
+
 
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