Fix whitespace and typos (#1481)

* Remove EOL whitespace in files other than docs

* Break paragraphs into lines

See http://rhodesmill.org/brandon/2012/one-sentence-per-line/ for the rationale

* Fix various typos

* Remove EOL whitespace in docs/commands/*.md

crates/nu-cli/src/commands/help.rs

@@ -87,8 +87,8 @@ Here are some tips to help you get started.
   * help commands - list all available commands
   * help <command name> - display help about a particular command
 
-Nushell works on the idea of a "pipeline". Pipelines are commands connected with the '|' character. Each stage 
-in the pipeline works together to load, parse, and display information to you.
+Nushell works on the idea of a "pipeline". Pipelines are commands connected with the '|' character.
+Each stage in the pipeline works together to load, parse, and display information to you.
 
 [Examples]
 

crates/nu-cli/src/commands/pick.rs

@@ -80,7 +80,7 @@ fn pick(
                         "No data to fetch.",
                         format!("Couldn't pick column \"{}\"", column),
                         path_member_tried.span,
-                        format!("How about exploring it with \"get\"? Check the input is appropiate originating from here"),
+                        format!("How about exploring it with \"get\"? Check the input is appropriate originating from here"),
                         obj_source.tag.span)
                     }
 

crates/nu-cli/src/env/environment_syncer.rs

@@ -208,7 +208,7 @@ mod tests {
                 assert_eq!(actual, expected);
             });
 
-            // Now confirm in-memory environment variables synced appropiately
+            // Now confirm in-memory environment variables synced appropriately
             // including the newer one accounted for.
             let environment = actual.env.lock();