[bug_fix] [exporter/pulsar] Change configuration option (open-telemetry#36579)

#### Description
I updated the name of the item `map_connections_per_broker` in the
config and description in readme. Changed from
`map_connections_per_broker` to `max_connections_per_broker`. From the
description of the item in readme, I think this should be a typo.

---------

Co-authored-by: Alex Boten <[email protected]>

Author: 2 people

.chloggen/bug_fix-pulsarexporter-change_configuration_option.yaml

@@ -0,0 +1,27 @@
+# Use this changelog template to create an entry for release notes.
+
+# One of 'breaking', 'deprecation', 'new_component', 'enhancement', 'bug_fix'
+change_type: bug_fix
+
+# The name of the component, or a single word describing the area of concern, (e.g. filelogreceiver)
+component: exporter/pulsarexporter
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: Change configuration option `map_connections_per_broker`, rename to `max_connections_per_broker`.
+
+# Mandatory: One or more tracking issues related to the change. You can use the PR number here if no issue exists.
+issues: [36579]
+
+# (Optional) One or more lines of additional information to render under the primary note.
+# These lines will be padded with 2 spaces and then inserted directly into the document.
+# Use pipe (|) for multiline entries.
+subtext:
+
+# If your change doesn't affect end users or the exported elements of any package,
+# you should instead start your pull request title with [chore] or use the "Skip Changelog" label.
+# Optional: The change log or logs in which this entry should be included.
+# e.g. '[user]' or '[user, api]'
+# Include 'user' if the change is relevant to end users.
+# Include 'api' if there is a change to a library API.
+# Default: '[user]'
+change_logs: [user]

exporter/pulsarexporter/README.md

@@ -63,7 +63,7 @@ The following settings can be optionally configured:
 - `timeout`: send pulsar message timeout (default: 5s)
 - `operation_timeout`: sets producer-create, subscribe and unsubscribe operations timeout (default: 30 seconds)
 - `connection_timeout`: timeout for the establishment of a TCP connection (default: 5 seconds)
-- `map_connections_per_broker`: max number of connections to a single broker that will kept in the pool. (default: 1 connection)
+- `max_connections_per_broker`: max number of connections to a single broker that will kept in the pool. (default: 1 connection)
 - `retry_on_failure`
     - `enabled` (default = true)
     - `initial_interval` (default = 5s): Time to wait after the first failure before retrying; ignored if `enabled` is `false`

exporter/pulsarexporter/config.go

@@ -35,7 +35,7 @@ type Config struct {
 	Authentication             Authentication `mapstructure:"auth"`
 	OperationTimeout           time.Duration  `mapstructure:"operation_timeout"`
 	ConnectionTimeout          time.Duration  `mapstructure:"connection_timeout"`
-	MaxConnectionsPerBroker    int            `mapstructure:"map_connections_per_broker"`
+	MaxConnectionsPerBroker    int            `mapstructure:"max_connections_per_broker"`
 }
 
 type Authentication struct {