[DOCS] Remove leading slash for consistency

docs/reference/ingest/common-log-format-example.asciidoc

@@ -94,7 +94,7 @@ include::common-log-format-example.asciidoc[tag=common-log-pipeline]
 ////
 [source,console]
 ----
-PUT /_ingest/pipeline/my-pipeline
+PUT _ingest/pipeline/my-pipeline
 {
 // tag::common-log-pipeline[]
   "processors": [
@@ -160,7 +160,7 @@ You’re now ready to index the logs data to a <<data-streams,data stream>>.
 +
 [source,console]
 ----
-PUT /_index_template/my-data-stream-template
+PUT _index_template/my-data-stream-template
 {
   "index_patterns": [ "my-data-stream*" ],
   "data_stream": { },
@@ -173,7 +173,7 @@ PUT /_index_template/my-data-stream-template
 +
 [source,console]
 ----
-POST /my-data-stream/_doc?pipeline=my-pipeline
+POST my-data-stream/_doc?pipeline=my-pipeline
 {
   "message": "212.87.37.154 - - [05/May/2099:16:21:15 +0000] \"GET /favicon.ico HTTP/1.1\" 200 3638 \"-\" \"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/52.0.2743.116 Safari/537.36\""
 }
@@ -188,7 +188,7 @@ the <<mapping-source-field,document source>>.
 --
 [source,console]
 ----
-GET /my-data-stream/_search?filter_path=hits.hits._source
+GET my-data-stream/_search?filter_path=hits.hits._source
 ----
 // TEST[continued]
 
@@ -262,8 +262,8 @@ The API returns:
 ////
 [source,console]
 ----
-DELETE /_data_stream/*
-DELETE /_index_template/*
+DELETE _data_stream/*
+DELETE _index_template/*
 ----
 // TEST[continued]
 ////