Fixed minor typo in docs (#3359)

docs/content/manual/dev/manual.yml

@@ -3333,7 +3333,7 @@ sections:
 
           Outputs one new input.
 
-          Note that when using `input` it is generally be necessary to
+          Note that when using `input` it is generally necessary to
           invoke jq with the `-n` command-line option, otherwise
           the first entity will be lost.
 

docs/content/manual/v1.7/manual.yml

@@ -3239,7 +3239,7 @@ sections:
 
           Outputs one new input.
 
-          Note that when using `input` it is generally be necessary to
+          Note that when using `input` it is generally necessary to
           invoke jq with the `-n` command-line option, otherwise
           the first entity will be lost.
 

docs/content/manual/v1.8/manual.yml

@@ -3333,7 +3333,7 @@ sections:
 
           Outputs one new input.
 
-          Note that when using `input` it is generally be necessary to
+          Note that when using `input` it is generally necessary to
           invoke jq with the `-n` command-line option, otherwise
           the first entity will be lost.