Update logql.md

docs/guide/logql.md

@@ -140,12 +140,14 @@ Return lines including the text "status 403" or "status 503" using regex
 
 We can use operations on both the log **stream selectors** and **filter expressions** to refine them.
 
-## ** Format  **
+## ** Filter Expressions  **
 
-### Parser Expression
-Parser expression can parse and extract labels from the log content. Those extracted labels can then be used for filtering using label filter expressions or for metric aggregations.
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+
+### ** Parser Expression **
+Parser expressions can parse and extract labels from the log content. Those extracted labels can then be used for filtering using label filter expressions or for metric aggregations.
 
-#### json
+#### `json`
 The json parser operates in two modes:
 
 * without parameters:
@@ -156,16 +158,18 @@ The json parser operates in two modes:
   * Using `| json label="expression"` in your pipeline will extract only the specified json fields to labels. 
   * ```{job="0.6611336793589486_json"} | json my_field="json_field"```
 
-#### logfmt
+#### `logfmt`
 The logfmt parser extracts any key=value pairs from the processed logs.
 
-#### regexp
+#### `regexp`
 The regexp parser operates against log string and requires named groups for matching.
 
-Example: extract a new label named `token` from a string ie: `YYYY-MM-DDT00:00:00Z ... Reserving 1.1Mb of memory`
+Example: extract a new label named `token` from a string ie: 
+```YYYY-MM-DDT00:00:00Z ... Reserving 1.1Mb of memory```
+
  * ```{type="clickhouse"} |~"Reserving" | regexp "Reserving (?<token>\\d+.\\d+)"```
 
-#### Line Format
+#### ** Line Format **
 Line Format expression allows the re-formatting of parts of a log line. It can extract items from parsed json.
 
 To extract a *parameter* we use "{{}}" to surround it and extract it as the displayed log line as a result. Any thing can be added to this line format, to allow for additional notes or formatting.
@@ -176,7 +180,7 @@ To extract a *parameter* we use "{{}}" to surround it and extract it as the disp
 
 Creates new log lines of the string "My field: VALUE"
 
-#### Label Filter Expression
+#### ** Label Filter Expression **
 Label filter expression allows filtering log line using their original and extracted labels. It can contain multiple predicates.
 
 A predicate contains a *label identifier*, an *operation* and a *value* to compare the label with.
@@ -186,6 +190,9 @@ Label filters work like label matchers and use the same operations (`=`,`!=`,`=~
 ```
 {job="0.6611336793589486_json"} | json | my_field="VALUE"
 ```
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+
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