manual.yml: some clarifications plus fixes for markdown bloopers (#2737)

docs/content/manual/manual.yml

@@ -325,7 +325,7 @@ sections:
           it does.  For example, using the current implementation of
           jq, we would see that the expression:
           
-              `1E1234567890 | .`
+              1E1234567890 | .
 
           produces `1.7976931348623157e+308` on at least one platform.
           This is because, in the process of parsing the number, this
@@ -384,13 +384,13 @@ sections:
       - title: "Object Identifier-Index: `.foo`, `.foo.bar`"
         body: |
 
-          The simplest *useful* filter is `.foo`. When given a
-          JSON object (aka dictionary or hash) as input, it produces
-          the value at the key "foo", or null if there's none present.
+          The simplest *useful* filter has the form `.foo`. When given a
+          JSON object (aka dictionary or hash) as input, `.foo` produces
+          the value at the key "foo" if the key is present, or null otherwise.
 
           A filter of the form `.foo.bar` is equivalent to `.foo|.bar`.
 
-          This syntax only works for simple, identifier-like keys, that
+          The `.foo` syntax only works for simple, identifier-like keys, that
           is, keys that are all made of alphanumeric characters and
           underscore, and which do not start with a digit.
 
@@ -399,15 +399,17 @@ sections:
           `."foo$"`, or else `.["foo$"]`.
 
           For example `.["foo::bar"]` and `.["foo.bar"]` work while
-          `.foo::bar` does not, and `.foo.bar` means `.["foo"].["bar"]`.
+          `.foo::bar` does not.
 
         examples:
           - program: '.foo'
             input: '{"foo": 42, "bar": "less interesting data"}'
             output: [42]
+
           - program: '.foo'
             input: '{"notfoo": true, "alsonotfoo": false}'
             output: ['null']
+
           - program: '.["foo"]'
             input: '{"foo": 42}'
             output: [42]

jq.1.prebuilt

@@ -258,7 +258,7 @@ Although the identity filter never modifies the value of its input, jq processin
 .
 .nf
 
-`1E1234567890 | \.`
+1E1234567890 | \.
 .
 .fi
 .
@@ -315,19 +315,19 @@ jq \'\. as $big | [$big, $big + 1] | map(\. > 10000000000000000000000000000000)\
 .IP "" 0
 .
 .SS "Object Identifier\-Index: \.foo, \.foo\.bar"
-The simplest \fIuseful\fR filter is \fB\.foo\fR\. When given a JSON object (aka dictionary or hash) as input, it produces the value at the key "foo", or null if there\'s none present\.
+The simplest \fIuseful\fR filter has the form \fB\.foo\fR\. When given a JSON object (aka dictionary or hash) as input, \fB\.foo\fR produces the value at the key "foo" if the key is present, or null otherwise\.
 .
 .P
 A filter of the form \fB\.foo\.bar\fR is equivalent to \fB\.foo|\.bar\fR\.
 .
 .P
-This syntax only works for simple, identifier\-like keys, that is, keys that are all made of alphanumeric characters and underscore, and which do not start with a digit\.
+The \fB\.foo\fR syntax only works for simple, identifier\-like keys, that is, keys that are all made of alphanumeric characters and underscore, and which do not start with a digit\.
 .
 .P
 If the key contains special characters or starts with a digit, you need to surround it with double quotes like this: \fB\."foo$"\fR, or else \fB\.["foo$"]\fR\.
 .
 .P
-For example \fB\.["foo::bar"]\fR and \fB\.["foo\.bar"]\fR work while \fB\.foo::bar\fR does not, and \fB\.foo\.bar\fR means \fB\.["foo"]\.["bar"]\fR\.
+For example \fB\.["foo::bar"]\fR and \fB\.["foo\.bar"]\fR work while \fB\.foo::bar\fR does not\.
 .
 .IP "" 4
 .
@@ -960,11 +960,21 @@ Specifically, for object inputs, \fBmap_value(f)\fR constructs the output object
 .P
 Here are some examples to clarify the behavior of \fBmap\fR and \fBmap_values\fR when applied to arrays\. These examples assume the input is \fB[1]\fR in all cases:
 .
-.P
-map(\.+1) #=> [2] map(\., \.) #=> [1,1] map(empty) #=> []
+.IP "" 4
 .
-.P
-map_values(\.+1) #=> [2] map_values(\., \.) #=> [1] map_values(empty) #=> []
+.nf
+
+map(\.+1)          #=>  [2]
+map(\., \.)         #=>  [1,1]
+map(empty)        #=>  []
+
+map_values(\.+1)   #=>  [2]
+map_values(\., \.)  #=>  [1]
+map_values(empty) #=>  []
+.
+.fi
+.
+.IP "" 0
 .
 .P
 \fBmap(f)\fR is equivalent to \fB[\.[] | f]\fR and \fBmap_values(f)\fR is equivalent to \fB\.[] |= f\fR\.